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Your dictionary for AI terms like LLM and RLHF
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What technical products actually do and why the companies that make them are valuable
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All Technically posts on software concepts since the dawn of time
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The dictionary of software terms you've always wanted

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Technically

Making practical sense of software and AI.

AI
Recent Articles

AI, tractors and the productivity paradox

Where are AI's productivity gains hiding? What kitted out Model Ts can teach us.

What’s an inference provider?

How the rise of open source AI models is fueling the growth of a new infrastructure category.

I Let Claude Code Autonomously Run Ads for a Month

Applying the Ralph Wiggum loop to things other than writing code.

AI Reference

GPU (Graphics Processing Unit)

GPUs are specialized chips that do thousands of simple calculations simultaneously, making them perfect for AI training

Transformers

Transformers are the neural network architecture that powers modern AI like ChatGPT, revolutionizing how models process language and other sequential data.

Terms

LLM

Large Language Models take in a prompt and generate text.

ChatGPT

ChatGPT is a Machine Learning model, created and maintained by OpenAI, that generates paragraphs of text in response to prompts.

All AI →
Analytics
Recent Articles

Databricks is apparently worth $100B. What do they even do?

What we should really be asking is “What does Databricks not do?”

Terms

Benchmark

A benchmark is a standard way of measuring the performance of a piece of software.

ETL

ETL stands for Extract - Transform - Load, and it’s the process of moving data around your internal systems to get it ready for analysis.

Companies
Databricks

Databricks

Databricks sells a data science and analytics platform built on top of an open source package called Apache Spark.

Segment

Segment

Segment helps teams track their product and marketing data and send it to whichever tools it needs to go to.

All Analytics →
Databases
Recent Articles

Why do developers choose different types of databases?

An intro to how companies like Elastic, MongoDB, Snowflake, Confluent and AWS compete.

Terms

GraphQL

GraphQL is a query language (and runtime) for building and using APIs: developers use it to simplify making API requests.

Multi-tenant

Multi-tenant simply means shared with someone else, like having a roommate in an apartment.

Companies
Confluent

Confluent

Apache Kafka is a framework for streaming real time data, and Confluent offers Kafka as a managed service.

MongoDB

MongoDB

MongoDB is a highly popular unstructured, NoSQL document database for powering your applications.

All Databases →
DevOps
Recent Articles

All about Infrastructure as Code

The deceptively simple text files that help you avoid huge mistakes when shipping software.

What's a Package Manager?

And why are AI labs buying them up?

A Beginner’s Guide to Bring Your Own Cloud

The profitable but challenging deployment model sweeping the nation.

Terms

Kubernetes

Developers use Kubernetes to turn their individual containers and virtual machines into full fledged, working applications.

Production

Production is the live, ready, tested, public facing version of your app.

Companies
Postman

Postman

Postman is a suite of tools that helps developers build, test, and use internal and external API endpoints.

Gitlab

Gitlab

GitLab is a giant tool for literally anything you'd want to do relating to building and deploying software.

All DevOps →
Security
Terms

VPN

A Virtual Private Network (VPN) lets you route your internet access through a specialized server that keeps your sensitive information private.

Tokenization

Tokenization is one of the ways that backends protect sensitive information, like credit cards or social security numbers.

Companies
Snyk

Snyk

Snyk helps developers make sure that the code they're writing is secure.

Okta

Okta

Okta is an enterprise-focused identity provider: they take care of managing usernames, passwords, and permissions.

All Security →

"Technically has allowed me better bridge the gap between user problems and how our system works under the hood."

— Adelaide Hallowell

Latest
How my non-engineering team at Sentry learned to ship

How my non-engineering team at Sentry learned to ship

We moved 2,500 pages out of our CMS with Claude Code and Git. 4 months ago, most of us hadn't written code.

Matt HendersonMatt Henderson

Recent

All about Infrastructure as CodeFree

The deceptively simple text files that help you avoid huge mistakes when shipping software.

Will RaphaelsonWill Raphaelson

What is Next.js?Free

The web framework your next vibe-coded app will probably be built in.

Justin GageJustin Gage

What's a Package Manager?

And why are AI labs buying them up?

Will RaphaelsonWill Raphaelson

AI, tractors and the productivity paradoxFree

Where are AI's productivity gains hiding? What kitted out Model Ts can teach us.

Sachin BennySachin Benny
AI ReferenceSee all →

The guide to AI that you've been looking for. Click on any term for an in depth explanation.

EmbeddingsEmbeddings are how AI models turn words, images, or other data into mathematical coordinates that computers can actually work with.InferenceInference is a fancy term that just means using an ML model that has already been trained.Prompt EngineeringPrompt engineering is the art of talking to AI models in a way that gets you the results you actually want.ReasoningAI reasoning is how artificial intelligence systems solve problems, think through complex situations, and draw conclusions from available information.
When not to vibe code

When not to vibe codeFree

Should I ship something myself, or call in engineering help?

Sarah Krasnik BedellSarah Krasnik Bedell
What’s an inference provider?

What’s an inference provider?

How the rise of open source AI models is fueling the growth of a new infrastructure category.

Will RaphaelsonWill Raphaelson
I Let Claude Code Autonomously Run Ads for a Month

I Let Claude Code Autonomously Run Ads for a MonthFree

Applying the Ralph Wiggum loop to things other than writing code.

A Beginner’s Guide to Bring Your Own Cloud

A Beginner’s Guide to Bring Your Own Cloud

The profitable but challenging deployment model sweeping the nation.

Will RaphaelsonWill Raphaelson
CompaniesSee all →

What their products actually do and why they're so valuable.

AlgoliaAlgolia
Algolia provides a set of tools that helps engineers build search functionality into their apps.
New RelicNew Relic
New Relic is observability software: teams use it to monitor the performance of their apps and infrastructure.
SentrySentry
Sentry helps developers diagnose and fix issues in their code.
TwilioTwilio
Twilio makes a suite of products that helps you communicate with your customers via SMS, video, calls, and more.
GlossarySee all →

Quick explanations of the concepts you see every day.

AuthenticationAuthentication is how the apps you use know that you are who you say you are: through something as simple as a password, or as complex as biometrics.BranchA branch is a specific version of your code repository.KernelEvery operating system is built off of a kernel, which is the core of the OS, doing most of the hardware management.MicroservicesMicroservices (all hype aside) are a way of building your application as a series of small, interacting services instead of one giant bundle of code.

Video

Analyzing all 203 million trades on Kalshi

Analyzing all 203 million trades on Kalshi

Kalshi just raised a new round at an $11B valuation. How much revenue does their prediction market really make?

Sam SchneiderSam Schneider
Relationships are the moat

Relationships are the moat

What's the forward deployed engineer role, and why is every startup hiring them?

Sung Won ChungSung Won Chung
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Contributors

Christy BieberChristy BieberJustin GageJustin GageKenny NingKenny NingMatt HendersonMatt HendersonSachin BennySachin BennySam SchneiderSam SchneiderSarah Krasnik BedellSarah Krasnik BedellSung Won ChungSung Won ChungWill RaphaelsonWill Raphaelson

Learning Tracks

Curated collections of foundational articles to guide you through the basics of getting more technical at work.

AI, it's not that complicated ↗

How to understand and work effectively with AI and ML models and products.

  • How do Large Language Models work?

    Breaking down what ChatGPT and others are doing under the hood

  • What's RLHF?

    How AI models learned to stop being weird and start being helpful.

  • What's GPT-3?

    GPT-3 is a Machine Learning model that generates text.

  • What’s a data science notebook?

    Data Science Notebooks help data teams explore data with code.

Analyzing Software Companies ↗

The products and business models of leading software companies.

  • Databricks is apparently worth $100B. What do they even do?

    What we should really be asking is “What does Databricks not do?”

  • What does Snowflake do?

    Snowflake sells a powerful cloud data warehouse for analytics and data science teams.

  • What does OpenAI do?

    OpenAI is the most popular provider of generative AI models like GPT-4.

  • What does dbt do?

    dbt (no capitals) is a tool for transforming and organizing data in your warehouse.

Building Software Products ↗

How to make positive contributions to your product roadmap.

  • The top 5 things PMs should know about engineering

    Engineering and code basics that can make you a better PM to work with.

  • What's code?

    Code is step by step directions, but for computers.

  • What's the internet?

    A network of computers all connected to each other and sharing information.

  • What's cloud?

    Cloud is how companies rent infrastructure over the internet.

From Spreadsheets to Databases ↗

You've outgrown Excel, but you've got to put that data somewhere besides your parents basement.

  • The Beginner's Guide to Databases

    There are 300+ databases; what do they all do?

  • SQL for the rest of us

    If you’re not a data scientist but you have questions, you want to know SQL.

  • The Excel User's Guide to Databases: Schemas

    Why that schema change is going to take your engineers two weeks.

  • The Excel User's Guide to Databases: Migrations

    Why your feature is held up by a migration and why this is actually good.

How AI Models Actually Work ↗

How do these things actual work under the hood? What does it mean to train one? Is it more like going to the gym, studying for a test, or sleeping?

  • What is Machine Learning?

    How computers learn patterns from data — and why it’s the foundation for everything from stock prediction to ChatGPT.

  • How do Large Language Models work?

    Breaking down what ChatGPT and others are doing under the hood

  • How do you train an AI model?

    A deep dive into how models like ChatGPT get built.

  • The beginner’s guide to AI model architectures

    Unlike an onion, hopefully these neural network layers won't make you cry.

Working With Data Teams ↗

How to make positive contributions when working with analytics and data science teams.

  • How do product analytics work?

    Product analytics is how teams instrument and analyze data about their product usage.

  • What your data team is using: the analytics stack

    A deep dive into all of the tools that data teams use to do their work.

  • SQL for the rest of us

    If you’re not a data scientist but you have questions, you want to know SQL.

  • What's the Modern Data Stack?

    The new set of tools data teams use to get their jobs done.

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