If you have an HTML website, it likely uses a really small amount of resources as it is static, but this isn't so with dynamic database-driven Internet sites that use PHP scripts and provide much more capabilities. This sort of Internet sites produce load on the hosting server each and every time someone browses them, because the hosting server needs time to execute the script, to access the database and then to supply the content requested by the visitor's browser. A popular discussion board, for example, stores all usernames and posts in a database, so some load is generated each time a thread is opened or an end user searches for a particular word. If many people access the forum at the same time, or if every search involves checking hundreds of thousands of database entries, this can generate high load and affect the overall performance of the website. In this regard, CPU and MySQL load data can present you with data about the site’s efficiency, as you can compare the numbers with your traffic data to determine if the website has to be optimized or migrated to a different kind of hosting platform that'll be able to bear the high system load in case the website is really popular.