Cache

Detailed Explanation

A cache is a temporary storage layer that keeps copies of frequently accessed data so it can be retrieved faster. Instead of fetching data from the database or API every time, the cached copy is used.

Caching happens at many levels: browser cache (stores downloaded files), CDN cache (stores files near users), server cache (stores database query results), and application cache (stores computed values in memory). Each level reduces load and speeds up your app.

For your React app, you might cache API responses to avoid refetching data the user just saw. Supabase automatically handles many caching layers. When performance matters, caching is one of the first things to implement.