"Everyone" and "everybody" are both correct and interchangeable in most contexts. They are used to refer to all the people in a group, without singling out individuals.
The main difference between the two is their formality:
"Everyone" is slightly more formal and is often preferred in written English or formal settings.
Example: "Everyone at the meeting agreed on the proposed plan."
"Everybody" is less formal and is commonly used in spoken English or informal contexts.
Example: "Hey, everybody, let's gather around and listen to the announcement."
In terms of meaning, both words refer to all the people in a group as a collective whole. They are synonymous and can be used interchangeably in most situations.
It's important to note that "everyone" and "everybody" are treated as singular pronouns. Therefore, verbs and pronouns that refer to them should also be in the singular form.
Example: "Everyone is invited to the party. They should bring their own drinks."
In summary, "everyone" and "everybody" have the same meaning and can be used interchangeably, with "everyone" being slightly more formal.