It joins separate words into a single word: m erry-go-round, off-shore, long-established, T-shirt.The hyphen is the shortest mark of the three and has two functions: In this article, you can read about their function and how to insert them in Word and Latex. These punctuations marks belong to the elite of punctuation but are actually quite easy.
There are three lengths of what non-typesetters simply think of as a dash: the hyphen (-), the en-dash (–), and the em-dash (-).