The storing of information in an easier to access location and/or format that came from a source of data in a more difficult to access location and/or format.
Some examples:
Browsers caching CSS/JS/Images because its easier to access from a local hard drive than a request across a network.
CPUs caching blocks of memory because its easier to access from on the same chip than to go over the motherboard to the main RAM.
dev.to caching the count of reactions because its easier to query one column on a record already queried for than to query a whole set of related records and count up the total.
Whenever there is heavy computation or long latency involved in fetching a value, some form of caching may be helpful. The pitfalls being when the source of information changes the cache needs to change as well; and caching too much can ironically slow the system down, since the cache now has higher latency to search/fetch data than getting it from the source.
The storing of information in an easier to access location and/or format that came from a source of data in a more difficult to access location and/or format.
Some examples:
Whenever there is heavy computation or long latency involved in fetching a value, some form of caching may be helpful. The pitfalls being when the source of information changes the cache needs to change as well; and caching too much can ironically slow the system down, since the cache now has higher latency to search/fetch data than getting it from the source.
Thanks for explaining