The Leads module is where all of your prospect information is gathered and stored. A Lead is a potential customer. A Lead can also be called a prospect. The Leads module contains contact information from business cards, trade show inquiries, or website contact forms. This module collects all of the information you have and starts the pipeline process for you to make a sale.
Marketing efforts can be used to convert outstanding leads into contacts and paying accounts.
Leads are the raw prospects of a company's sales cycle. They're the first step on the path to revenue generation.