Every time a visitor opens your website, the Internet browser sends a request to the hosting server, which executes it and provides the desired content as a response. A standard HTML Internet site uses very little resources due to the fact that it's static, but database-driven platforms are more demanding and use much more processing time. Every page which is served produces two forms of load - CPU load, which depends on the amount of time the hosting server spends executing a specific script; and MySQL load, that depends on the number of database queries created by the script while the customer browses the Internet site. Bigger load will be created if a considerable amount of people surf a particular Internet site at the same time or if a considerable amount of database calls are made concurrently. Two good examples are a discussion board with a huge number of users or an online store in which a visitor enters a term in a search box and tens of thousands of items are searched. Having comprehensive stats about the load your site generates will enable you to improve the content or see if it is time for you to switch to a more powerful type of hosting service, if the website is simply getting extremely popular.