Answer:
A subset is a set contained in another set
It is like you can choose ice cream from the following flavors:
{banana, chocolate, vanilla}
You could choose any one flavor {banana}, {chocolate}, or {vanilla},
Or any two flavors: {banana, chocolate}, {banana, vanilla}, or {chocolate, vanilla},
Or all three flavors (no that isn't greedy),
Or you could say "none at all thanks", which is the "empty set": {}
A Set With Three Elements:
How about:
{apple, banana, cherry}
OK, let's be more systematic now, and list the subsets by how many elements they have:
Subsets with one element: {apple}, {banana}, {cherry}
Subsets with two elements: {apple, banana}, {apple, cherry}, {banana, cherry}
And:
the whole set: {apple, banana, cherry}
the empty set: {}
In fact we could put it in a table:
(hope i helped)
