"Helvetica" is a font that came out of Switzerland in the 1950s. It's considered very readable and simple, and its use became extremely widespread. The movie talks a bit about the origins of the font and shows a lot of its uses on signs, ads, letterhead, and store windows. And it spends a lot of time with typographers, font designers, and graphic artists, who argue about why it became the powerhouse it is, why it's great, or why they hate it and it should die.
With a relatively short run-time of 80 minutes, I still found this one way too long. If you like listening to these people talk and rant their opinions about fonts, you might enjoy it. But to me the only thing that appealed was the origins and design of the original font, which occupied perhaps five minutes of the movie. The rest was just ... opinions.