Every time a visitor opens your site, the browser sends a request to the hosting server, which in turn executes it and gives the necessary data as a response. A basic HTML Internet site uses minimum resources for the reason that it is static, but database-driven platforms are more demanding and use a lot more processing time. Each page which is served creates 2 forms of load - CPU load, which depends on the time the hosting server spends executing a particular script; and MySQL load, that depends on the total number of database queries produced by the script while the user browses the Internet site. Bigger load will be produced if a lot of people surf a particular Internet site at the same time or if loads of database calls are made simultaneously. 2 examples are a discussion board with thousands of users or an online store in which a client enters a term within a search box and tens of thousands of items are searched. Having in depth data about the load that your website generates will enable you to optimize the content or see if it's time for you to switch to a more powerful kind of web hosting service, if the website is simply getting really popular.