Answer 1

It is made for easy indexing of items in a list. Quick example:

letters = ['a', 'b', 'c', 'd']
enum_letters = enumerate(letters)
print(list(enum_letters))

It will give output:
[(0, 'a' ), (1, 'b'), (2, 'c'), (3, 'd')]

Or you can do:
for i, j in enum_letters:
print(i, j)

And it will give:
0 a
1 b
2 c
3 d