Helvetica is one of the world’s most popular typefaces; you’ve probably already seen it multiple times today. It’s a Neo-Grotesque typeface, based largely on Akzidenz-Grotesk, my favorite typeface.
Characterized by horizontal and vertical ends on all of its strokes and very tight letter spacing, Helvetica is iconic in how neutral it looks. It became a staple of the International Typographic Style (Swiss Style) that spread through much of the world in the 50s and 60s.
People use it for all kinds of things, but honestly—it’s a bit outplayed at this point. I would argue that for every job in which Helvetica would be good, there is always a typeface that would be better. Just keep searching for the right one. (Whenever you’re about to use Helvetica, ask yourself if Univers might be better. They’re pretty similar, but at least Univers doesn’t have so strong association with corporate life.)