Released in 2005, Proxima Nova is an extremely popular typeface designed by Mark Simonson. It is often described as a hybrid of Futura and Akzidenz Grotesk, combining a geometric appearance with modern proportions. In my opinion, Proxima Nova’s use on the web is so ubiquitous that it is starting to feel a little overused. It’s still an excellent font though, so there’s a reason for its popularity. Proxima Nova is available in seven weights — thin, light, regular, semibold, bold, extrabold and black — each with matching italics as well as small caps styles and condensed and extra condensed widths.
If you are looking for an alternative to Proxima Nova, I recommend checking out Nexa and Avenir. I think Baskerville would make a nice font combination paired with it.