Learn Italian: È un uomo.

In Italian, you don't always need to use subject pronouns like lui (he) or io (I). The verb è means "is", and since we are talking about a man, "he" is automatically understood. Saying Lui è un uomo is also correct, but dropping the pronoun is the most natural and common way to speak.

Why does È have an accent mark?

The accent mark distinguishes è (is) from the word e (and). Writing the accent is mandatory so readers know which one you mean, and it also slightly changes how the vowel is pronounced.

Should there be an apostrophe before uomo since it starts with a vowel?

No, you only use an apostrophe for feminine words that start with a vowel (which use un'). Since uomo is a masculine word, it simply takes the standard masculine article un with no apostrophe: un uomo.

Can È un uomo also mean "It is a man"?

Yes! Because the subject pronoun is dropped, the word è by itself can translate to "he is", "she is", or "it is". You rely on the context of the conversation to know which one makes sense.