What is the difference between a hyphen and an em-dash?

A hyphen (-) is a punctuation mark used to connect Words or parts of Words, such as in compound adjectives (e.g., well-known) or to separate syllables. An em-dash (—) is a longer punctuation mark used to create a strong break in a sentence, often to set off information or indicate a pause for emphasis. While both marks can enhance clarity, their functions and appearances are distinct.