why using zip in python code example

Example 1: python zip function

>>> numbers = [1, 2, 3]
>>> letters = ['a', 'b', 'c']
>>> zipped = zip(numbers, letters)
>>> zipped  # Holds an iterator object
<zip object at 0x7fa4831153c8>
>>> type(zipped)
<class 'zip'>
>>> list(zipped)
[(1, 'a'), (2, 'b'), (3, 'c')]  #list of tuples  
# zip returns tuples

Example 2: zip python

>>> x = [1, 2, 3]
>>> y = [4, 5, 6]
>>> for t in zip(x, y):
...   print(t)
...
(1, 4)
(2, 5)
(3, 6)