What's the difference between a hyphen, en dash, and em dash? Provide examples with each symbol.
- The hyphen (-) is the narrowest. It is used to join parts of a word together, such as e-mail and ice-cream, or connect words that must be understood as a unit. For example, a one-meter-long rope and a pet-friendly hotel. When a word can’t fit on a line, a hyphen is also used to split it into two lines between syllables.

- The en dash (–) is wider, approximately as wide as the letter N. It is usually used to show the relationship between two words or values such as dates. For example, the teacher–student relationship, the score of the game is 16–10, and the 1929–1939 depression

- The em dash (—) is the widest, approximately as wide as the letter M. It is used to emphasize and bring attention to some words in a sentence, and usually can be seen as commas. For example, The hotel — an old building with frequent power outages — is still quite popular.
When should em-dashes be used instead of commas? Are they interchangeable? Also, how are they different from parentheses?