There are three basic formulations of foundation: liquid, cream and powder. The formulation you use should depend on a few factors: Do you have a lot of excess shine? Do you have patches of dry, flaky skin? Are there dark circles, blemishes or other areas on the skin you would like to minimize? What texture feels comfortable on your skin?
The right everyday foundation will make your skin look naturally radiant. It should feel comfortable on your skin all day long and not require much maintenance through the day. The current trend in foundation application is to apply only where needed, most likely toward the center of the face, and letting your natural skin shine through wherever possible.