Everyone Vs Every one

Everyone is a pronoun and used to refer a group of people.

For examples:

• Everyone had fun at the party.
• Julia suggested that everyone should bring something for tomorrow's event.

Every one, on the other hand, is a noun that refer to each and every person.

For examples :

• Every one of the students passed the exams.
• The boss talked to each and every one of his employees regarding the issue.