A lead capture pages refers to a page that contains an opt-in form. This page is designed to "capture" a visitor's (lead's) contact information, so you can continue marketing to this person in the future. Following up with a visitor helps to turn them from a lead into a customer.
A lead capture page generally contains limited information. Generally, it contains just enough to pique a visitor's interest, offering them a deal, information, product, etc. that they're willing to trade their contact information to access.
A lead capture page will then re-direct to a tour, or informational, page that contains further information about the deal, product, business, etc.