Avenir

Avenir is a sans-serif font. It goes well with Didot, Minion, Helvetica Neue, Georgia, Sabon Next, Century School, Avenir Next, FF Meta Serif, New Caledonia and Monotype Century School. If you're thinking about using Avenir then try 30px for headers. Give 14px a shot for content.

People commonly tag it as sans serif, modernist, design, app, ecommerce, agency, photo, marketing, fashion and contrast. You can get it from Fonts.com, Fontshop and MyFonts.