Caching is the process of copying the data and having it in memory instead of getting the data again through an external resource, such as a network, file, or database. The data used in caching is ephemeral and can be removed at any time. As we are directly accessing the data, caching can greatly improve the performance of the application.
Caching can be done in any of the layers—client-side at the browser, at the proxy server (or at some middleware), or at the web/application server. For database layer caching, we might not need to do any custom coding. Based on the type of database server being used, you might need to make some configuration changes. However, most of the databases these days are powerful enough to cache the data as and when it is needed.