When a visitor opens your site, the browser sends a request to the web server, which in turn executes it and provides the required data as a response. A simple HTML website uses minimum system resources because it is static, but database-driven platforms are more demanding and use far more processing time. Each page which is served generates two types of load - CPU load, which depends on the length of time the hosting server spends executing a particular script; and MySQL load, that depends on the number of database queries produced by the script while the end user browses the Internet site. Higher load will be created if a lot of people surf a certain site at the same time or if loads of database calls are made simultaneously. Two examples are a discussion board with thousands of users or an online store in which a customer enters a term within a search box and tens of thousands of items are searched. Having detailed statistics about the load which your website generates will help you improve the content or see if it is the perfect time to switch to a more powerful type of website hosting service, if the website is simply getting quite popular.