When a visitor opens your Internet site, the Internet browser sends a request to the hosting server, which executes it and provides the desired content as a response. A simple HTML website uses negligible system resources because it's static, but database-driven platforms are more demanding and use much more processing time. Each and every webpage that's served creates 2 sorts of load - CPU load, which depends on the amount of time the web server spends executing a particular script; and MySQL load, which depends on the total number of database queries generated by the script while the client browses the Internet site. Larger load will be generated if a considerable amount of people browse a particular Internet site concurrently or if loads of database calls are made simultaneously. 2 good examples are a discussion board with tens of thousands of users or an online store where a client enters a term within a search box and thousands of items are searched. Having comprehensive data about the load your site generates will help you optimize the content or see if it is time for you to switch to a more powerful sort of website hosting service, if the site is simply getting really popular.