When a visitor opens your Internet site, the web browser sends a request to the hosting server, which in turn executes it and supplies the required data as a response. A simple HTML website uses minimal resources for the reason that it is static, but database-driven platforms are more requiring and use a lot more processing time. Every page which is served creates 2 types of load - CPU load, that depends on the length of time the hosting 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. Larger load shall be created if a considerable amount of people surf a given website concurrently or if a considerable amount of database calls are made all at once. 2 good examples are a discussion board with a large number of users or an online store where a client enters a term within a search box and tens of thousands of items are searched. Having comprehensive stats about the load that your website generates will allow you to improve the content or see if it's time to switch to a more powerful sort of website hosting service, if the Internet site is simply getting very popular.