[DUPLICATE] What is cache ?

Answer 1

Browser Cache :
Cache is the temporary memory which is generally used in browsers. Cache store the site pages, images, logos in the client machine to reduce bandwidth usage, server load, and perceived lag when you visit the site second time, it reloads the already stored data loading the webpage faster.
You can also change your cache preferences in your browser settings.

Web Cache :
 A web cache stores copies of documents passing through it, subsequent requests may be satisfied from the cache if certain conditions are met. Google's cache link in its search results provides a way of retrieving information from websites that have recently gone down and a way of retrieving data more quickly than by clicking the direct link.

CPU Cache :
In CPU, the cache is a smaller, faster memory which stores copies of the data from the most frequently used main memory locations. and reduces the average time to access memory.

Answer 2

cache is a memory which is structured or placed before main memory when we search any information then this information is searched first in cache memory if their the page is not available then it goes in main memory where it's execution is done and a copy of it is stored in cache memory for future reference if in future we need to go through that page again then we can find our page in cache memory which is stored as cache by this the execution of problems is fast because cache memory is present before the main memory

Answer 3

Basically, it's some sort of storage whose purpose is to have results ready if computation is asked for. It can range from physical memory in CPU to structures in your code.