M+ 1p is a set from the M+ Outline Fonts Project, which has developed a super-family set of free web fonts consisting of four sub families. For M+ 1p, the team created a proportional font with seven ...
Of course, if you simply want your text to be legible, there's no reason you can't use a normal font like Helvetica (or one of these free fonts to get you started). But if you're trying to convey a ...