Set is a well defined collection of objects.
Set is well defined -
i.e. it doesn’t change from person to person
Example
Collection of natural numbers less than 6
-a-
Natural numbers = 1, 2, 3, 4, 5, 6, 7,…
Natural numbers less than 6 = 1, 2, 3, 4, 5
Since Collection of natural numbers until 5 is known and can be counted (well –defined)
It is a set
-ea-
Collection of 5 best cricketers of the world
-a-
Some people will say Sachin Tendulkar is the best, some say Virat Kohli.
Some say MS Dhoni.
Since you can have different players, I can have different players. So, the collection varies from person to person.
So, the collection is not well-defined.
Hence it is not a set.
-ea-
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