Landing Page

This the page that visitors arrive into your site; its their entry point, and typically but not always its your home page.

With organic search its Google who decides which pages are entry points, not you; although with careful design you can exert influence.

In Pay Per Click (PPC) advertising systems like Adwords the landing page can make a significant amount of difference in conversions and so there is usually careful consideration of landing page design, call to action etc