Caching helps you to speed up your WordPress site and hence gives better user experience. Actually caching creates copy of webpages as static ones, then saves it on server including cached database queries and when your site visitors requests page they get cached page from the server. This reduces the use of resources and makes pages to load fast.
Here are five popular cache plugins for WordPress, visit each plugin’s page, read about its features then use the one works best for you. Using these plugin you can improve your site performance, give a better user experience via caching: browser, page, object, database, minify and content delivery network support etc.