Each time a visitor opens your site, the web browser sends a request to the web server, which executes it and gives the required content as a response. A simple HTML website uses minimum system resources for the reason that it is static, but database-driven platforms are more demanding and use far more processing time. Every single page that is served generates two forms of load - CPU load, that depends on the span of time the hosting server spends executing a certain script; and MySQL load, that depends on the total number of database queries created by the script while the client browses the site. Bigger load shall be produced if loads of people browse a certain website concurrently or if a considerable amount of database calls are made all at once. Two examples are a discussion board with a huge number of users or an online store in which a visitor enters a term within a search box and thousands of items are searched. Having comprehensive data about the load your Internet site generates will allow you to improve the content or see if it is time for you to switch to a more powerful sort of website hosting service, if the website is simply getting extremely popular.