Every time a visitor opens your Internet site, the browser sends a request to the hosting server, which in turn executes it and provides the required content as a response. A standard HTML website uses minimum system resources for the reason that it's static, but database-driven platforms are more demanding and use much more processing time. Each webpage that's served generates two forms of load - CPU load, which depends on the span of time the hosting server spends executing a certain script; and MySQL load, that depends on the number of database queries generated by the script while the client browses the Internet site. Higher load will be generated if a considerable amount of people look through a given site all at once or if many database calls are made simultaneously. 2 examples are a discussion board with thousands of users or an online store in which a customer enters a term in a search box and tens of thousands of items are searched. Having detailed stats about the load that your website generates will enable you to improve the content or see if it's time to switch to a more powerful sort of hosting service, if the site is simply getting really popular.