Come to know the set.
In the daily life. We have seen and are familiar with the allocation of things that look alike. The bulk is the same Or it may be different but some aspects together, which we used words Such as the faculty (teachers, ministers, crowd (the monkey birds, fish), groups (politicians. Military-maid), etc.
set is undefined. Don't give the word remember the definition
.In mathematics, we use the word "set (Set)." one word only to discuss a group of things and is used in the case of certainly know what is and what is not in the group discussed.