website which has only one main goal: to generate leads / attract paying customers.
Such websites usually consist of 1 page (the homepage usually) and they have an opt-in form somewhere on that page... or a "book us" / "get a quote" button / section... or maybe a "call us now" button... or they have a form that you need to fill in and submit...
The point is that such websites usually have no, or very little content and they are designed to make the visitors take an action, such as: submitting a form, signing up for a newsletter, making a phone call, etc. so that the owner of the site gets a lead / paying client