ELI5: Explain Like I'm 5

Cache algorithms

Cache algorithms are a way to store data so that it can be found and used quickly. They work like a small computer memory, and are used by programs like web browsers and search engines. The idea is that when you ask for a web page or search for something, the data is stored in the cache so that next time you ask for it, it can be delivered faster. This is why websites and searches can load quickly even if you're on a slow internet connection.
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