Every time a visitor opens your site, the browser sends a request to the server, which executes it and provides the required data as a response. A simple HTML Internet site uses minimal system resources because it's static, but database-driven platforms are more requiring and use a lot more processing time. Each and every page which is served produces 2 kinds of load - CPU load, which depends on the span of time the web server spends executing a particular script; and MySQL load, that depends on the total number of database queries produced by the script while the end user browses the website. Greater load will be created if a considerable amount of people look through a given site all at once or if numerous database calls are made simultaneously. Two examples are a discussion board with tens of thousands of users or an online store where a customer enters a term within a search box and tens of thousands of items are searched. Having thorough data about the load that your site generates will help you improve the content or see if it is the perfect time to switch to a more powerful kind of hosting service, if the website is simply getting quite popular.