If you have an HTML website, it probably uses a small amount of resources due to the fact that it's static, but this is not the situation with dynamic database-driven Internet sites that use PHP scripts and offer you a lot more features. This kind of websites create load on the web hosting server every time someone browses them, simply because the hosting server needs time to execute the script, to access the database and then to supply the info requested by the visitor's web browser. A famous discussion board, as an illustration, stores all usernames and posts within a database, so some load is generated every time a thread is opened or a user searches for a given term. If many people connect to the forum all at once, or if every single search involves checking tens of thousands of database entries, this can produce high load and affect the functionality of the Internet site. In this regard, CPU and MySQL load data can provide data about the site’s performance, as you can compare the numbers with your traffic stats to determine if the website should be optimized or moved to another type of web hosting platform which will be able to bear the high system load in case the site is really popular.