Comma is perhaps the most abused and misused punctuation mark in English. It may be just a tiny mark on a page, but a lot can depend on it. It makes a big difference in what you convey. Used wrongly, it may even cause dire misunderstanding. This video by Arika Okrent, which is produced for Mental Floss, presents five types of comma that can make or break a sentence.
Top image credit: brett jordan/Flickr.
[Source: Arika Okrent via YouTube.]