If you have an HTML website, it probably uses a really small amount of system resources as it is static, but that isn't the case with dynamic database-driven Internet sites that use PHP scripts and offer you considerably more features. This kind of sites create load on the hosting server every time someone browses them, since the server requires time to execute the script, to access the database and then to supply the data requested by the visitor's Internet browser. A famous discussion board, as an illustration, stores all usernames and posts within a database, so some load is produced every single time a thread is opened or an end user searches for a particular term. If a lot of people access the forum at the same time, or if every search involves checking a large number of database entries, this may generate high load and affect the functionality of the site. In this regard, CPU and MySQL load stats can give you data about the site’s efficiency, as you can compare the numbers with your traffic statistics to make a decision if the website should be optimized or moved to a different sort of web hosting platform that'll be able to bear the high system load in the event that the website is very popular.