People who visit your web site deserve to know what you’re doing or what you will do with the information you ask from them online. Respect that privilege and tell them why you’re asking for some personal or business information on your web site. Serious people do serious things. Terms of Use are the rules people should know to navigate your web site. It usually contains information about price and/or content changes on your web site. It must advise people that information on your web site might change without having to inform all your visitors about those changes and that as the owner, you set these rules.