Target audience is a group of people.
In Target audience we can display content such as list or library items and entire web parts to a group of people. If you want to present information to particular group of people.
Attendees are individual users.
- "Target Audience" means to whom a particular event is scheduled.
- "Attendees" means people who need to attend the event.
- "Target Audience" may be 100 but it is not that all 100 need to attend the meeting out of hundred there may be 75 who has to attend the meeting.