The hyphen is a mark of punctuation that joins words into a single unit.
A hyphen (-) is a shorter mark than a dash (—). Hyphens join; dashes separate.
Hyphens are used in the following situations:
with compound words
with compound modifiers
with fractions and compound numbers
with prefixes
to resolve ambiguity
to divide words at line endings
Exercises:
The hyphen 1
The hyphen 2
Related topic:
Dash