font
Avenir is a sans-serif font. It goes well with Didot, Minion, Georgia, Helvetica Neue, Tiempos, Century School, Futura PT, Sabon Next, Canela and Comfortaa. 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, agency, portfolio, photo, fashion, app, product and ecommerce. You can get it from Fonts.com and MyFonts.
Avenir on its own
58 Avenir samples