Every time a visitor opens your Internet site, the Internet browser sends a request to the web server, which executes it and provides the necessary information as a response. A simple HTML Internet site uses minimal system resources because it's static, but database-driven platforms are more requiring and use a lot more processing time. Every webpage which is served creates two forms of load - CPU load, that depends on the time period the hosting server spends executing a certain script; and MySQL load, that depends on the total number of database queries generated by the script while the user browses the site. Bigger load shall be created if many people surf a given Internet site at the same time or if a lot of database calls are made simultaneously. 2 examples are a discussion board with tens of thousands of users or an online store in which a customer enters a term inside a search box and thousands of items are searched. Having thorough stats about the load which your Internet site generates can help you optimize the content or see if it is time to switch to a more powerful type of hosting service, if the Internet site is simply getting extremely popular.