What is Caching?Types of Caching?

• Caching is a concept of frequently used data is stored into temporary memory for faster access.
• This is the Optimization technique to improve the performance of application.

Basically, caching is of 3 types

1. Output caching
2. Fragment caching
3. Data Caching

1. Output caching - The rendered html page is stored into the cache before sending it to the client. Now, if the same page is requested by some other client the already rendered htm page is retrieved from the server memory and sent to the client, which saves the time requires rendering and processing the complete page.
2. Fragment caching - Instead of caching the complete page, some portion of the rendered html page is cached. E.g.: User Control used into the page is cached and so it doesn’t get loaded every time the page is rendered.
3. Data Caching - The important pieces of information, that are time consuming and frequently requested, are stored into the cache. For example a data set retrieved from the database. It is very similar to application state but it is more server friendly as the data gets removed once the cache is filled.