When a visitor opens your website, the browser sends a request to the server, which in turn executes it and provides the necessary information as a response. A simple HTML Internet site uses minimum resources because it is static, but database-driven platforms are more demanding and use far more processing time. Every page which is served creates two forms of load - CPU load, that depends on the span of time the server spends executing a particular script; and MySQL load, which depends on the number of database queries generated by the script while the user browses the Internet site. Greater load shall be produced if a lot of people surf a certain site concurrently or if many database calls are made simultaneously. Two examples are a discussion board with a large number of users or an online store in which a visitor enters a term inside a search box and tens of thousands of items are searched. Having in depth stats about the load your site generates will allow you to improve the content or see if it's the perfect time to switch to a more powerful kind of website hosting service, if the Internet site is simply getting extremely popular.