A form object is an element of a web page that allows that user to submit specific types of information. All form objects MUST reside within a form that has a specified name in order to work. A form can take up an entire web page, or just part of it. You can also have several forms on a single web page. You CANNOT, however, have a single form span multiple web pages.
In html code the <form> tag anchors the beginning of the form area of the web page, and the </form> tag anchors the end of the form area. In Dreamweaver when you insert a form, the form area appears surrounded by a dotted red line.