A database is just a place to store data; even Excel is technically a database. But when developers talk about databases, they’re usually referring to specialized software that’s used to store data from applications. When you sign up for Facebook, a new entry gets added to Facebook’s users database with a bunch of information about you; every time you sign in after that, that data gets pulled and used (this is part of what a backend is).
Database
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What's a relational database?
How most developers store and analyze application data.
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