Caching

Its a process that refers to storing the results of an operation so that future results (made by the client) return faster.

these kind of results are usually stored :

• making a query to the database
• rendering images
• rendering HTML etc etc.

It's necessary to cache when either:

• the computation is slow
• the computation will run multiple time
• the output is the same for a particular input
• the hosting provider charges you to access the database

Caching explained