Here are some ways to break down the meaning:
* Gather: Come together in a single place.
* Group: A collection of people.
* Purpose: A specific reason for gathering.
Examples:
* "People congregated in the town square to watch the parade."
* "The students congregated in the library to study for their exams."
* "The birds congregated on the branches of the tree."
Congregating can be formal or informal, and the size of the group can vary. It is often used to describe people coming together for social, religious, or political reasons.