Each time a visitor opens your site, the browser sends a request to the hosting server, which in turn executes it and gives the desired data as a response. A standard HTML website uses very little resources because it is static, but database-driven platforms are more demanding and use far more processing time. Every single page that's served produces 2 forms of load - CPU load, that depends on the amount of time the web server spends executing a particular script; and MySQL load, which depends on the total number of database queries created by the script while the client browses the site. Higher load shall be generated if many people browse a certain Internet site concurrently or if a considerable amount of database calls are made simultaneously. Two illustrations are a discussion board with a huge number of users or an online store where a customer enters a term inside a search box and a large number of items are searched. Having comprehensive statistics about the load which your website generates will allow you to optimize the content or see if it is time to switch to a more powerful kind of hosting service, if the website is simply getting extremely popular.