Cache

Caching is the process of storing things (webpages, images, etc.) closer to whoever is requesting them so that those things load faster. 

When you load a web page or an app, you’re requesting files from a server – and that server can be physically far away. Developers will cache content on servers closer to you so that those web pages and apps will load faster. Because web page and apps change all the time, you can set a timer on cached content to force it to expire. Specialized server networks called CDNs let you cache content easily across the globe.