The Forms application enables content editors to create and publish on-line forms. Forms allow you to gather structured data from your site's visitors. A typical example can be a 'Contact Us' form or a form in which visitors provide some necessary data to attain a specific goal.
The information provided via forms can be used to update the contacts that represent your website's visitors. For example, forms can be a way for visitors to provide email addresses that you can then use to send marketing emails (for visitors who give the required consent).