Caching is a technique that is used to store frequently accessed data in a temporary storage area, called a cache, so that it can be quickly accessed in the future. This is done to improve the performance of a system by reducing the time it takes to access data from slower storage media, such as a hard drive or network server.
Caching can be used in a variety of contexts, including in computer hardware, software, and web development. For example, a web browser may cache frequently accessed web pages in order to reduce the time it takes to load them. Similarly, a computer's CPU may cache frequently accessed data from the main memory in order to speed up processing.
There are several types of caches, including memory caches, disk caches, and browser caches. Each type of cache has its own specific characteristics and is used in different situations to improve the performance of a system.
A Content Delivery Network (CDN) is a network of servers that are distributed across the globe and are used to deliver content to users based on their geographic location. CDN caching is a technique that is used to store frequently accessed content on servers that are part of the CDN, so that it can be quickly delivered to users when they request it.
CDN caching is used to improve the performance of a website by reducing the time it takes to deliver content to users. When a user requests content that is stored on a CDN, the CDN will automatically redirect the request to the nearest server, which can deliver the content faster than if it had to be retrieved from the origin server. This can help to reduce the load on the origin server and improve the overall performance of the website
CDN caching can be used for a variety of types of content, including static content such as images and videos, as well as dynamic content such as HTML pages and API responses. CDN providers typically offer a variety of caching options and tools to help website owners optimize their content delivery and improve the performance of their websites.