If you have an HTML Internet site, in all probability it uses a very small amount of resources simply because it's static, but this is not the situation with dynamic database-driven Internet sites that use PHP scripts and provide considerably more capabilities. This kind of sites generate load on the website hosting server anytime someone browses them, because the web server needs time to execute the script, to access the database and then to deliver the content requested by the visitor's browser. A well known discussion board, for instance, stores all usernames and posts within a database, so some load is generated each time a thread is opened or a user looks for a given phrase. If many people connect to the forum concurrently, or if every search involves checking tens of thousands of database entries, this could create high load and affect the functionality of the site. In this regard, CPU and MySQL load data can provide info about the site’s overall performance, as you can compare the numbers with your traffic stats and see if the Internet site needs to be optimized or moved to a new type of web hosting platform that will be able to bear the high system load in case the website is popular.