What is Cache?
- As its expensive to every-time fetch data from the main storage, we story it in temporary location from where it can be retrieved faster. This temporary location is called Cache.
- A Cache is made of pool of entries and these entries are a copy of real data which are in storage and it is tagged with a tag (key identifier) value for retrieval.
- When an application receives a request to get a particular information, it is first checked in cache. If an entry is found with a tag matching with the request, it will be returned. Else it will be fetched from the main storage, kept in Cache and then returned to the client.
