Final answer:
Caching is a technique used to store frequently accessed data and serve it quickly, reducing the load on the web app, client, and server. Both client-side and server-side caching can be implemented to improve performance.
Step-by-step explanation:
Caching is a technique used to store frequently accessed data and serve it quickly, reducing the load on the web app, client, and server. In a web app, caching can be implemented both on the client-side and server-side. On the client-side, caching can be achieved by storing data in the browser's cache.
For example, images, CSS, and JavaScript files can be cached by setting the appropriate cache-control headers. This allows the browser to retrieve these resources from its cache instead of making a request to the server every time.
On the server-side, caching can be implemented by storing data in a cache server, such as Redis or Memcached. When a request is made for a particular data, the server checks if it exists in the cache. If it does, it retrieves the data from the cache instead of fetching it from the database, resulting in faster response times.