As an adverb (standalone):
As a noun modifier:
それぞれ means "each", "respectively", or "each one" and is used to emphasize that individual members of a group have their own separate characteristics, actions, or situations. It highlights individuality within a group rather than treating the group as a whole.
それぞれ can directly modify a verb, expressing that each person or thing does something individually.
When followed by の, それぞれ functions as a noun modifying another noun, meaning "each person's" or "each one's."
それぞれ is used after listing two or more items to indicate that something applies to each of them individually – similar to English "respectively."