Cache is a type of temporary storage that provides high-speed data access. It's typically used to store data that's frequently accessed by a computer program, so future requests for that data can be served faster. Caches exist in various levels including hardware (like CPU caches), operating systems, web browsers, and software applications.
Proper cache management can significantly improve the performance and efficiency of applications by reducing the need to access the main memory or make database calls repeatedly for the same data.