Forms can be big or small, have security or not.

• Forms are a convenient way for visitors to your site to contact you.
• Visitors are able to send you an email via the form without the need for a special email account
• Forms allow you to control the required information that you need, i.e. phone numbers, geographical data, etc..
• Forms allow you to control where the information collected is to be sent. You probably won't want to be the first contact forever, so you can get the email redirected to different people or departments, e.g. sales, support, etc..