A cache (also called a cache) is a temporary or, in other words, cache. The data is cached the first time you visit the website. On the second visit, the page loads faster thanks to the saved data.
Website without caching
If you want to view a WordPress page that doesn’t use caching, it takes longer to load posts. This is because the web server loads the files stored in the database, creates an html file from them, and then displays it in your browser. This process will take some time. If the page does not use caching, this process is repeated each time you visit the page.
Reason for using cache
If the same web page used caching, the html would only be created on the first visit to the page and stored on the server. The next time you visit, the html data would be retrieved from the server. Using caching increases page load speed and reduces server load. This will speed up your page 2 to 5 times.