how does the urllib work in python code example

Example 1: urllib python

#Used to make requests
import urllib.request

x = urllib.request.urlopen('https://www.google.com/')
print(x.read())

Example 2: urllib3 python

>>> import urllib3
>>> http = urllib3.PoolManager()
>>> r = http.request('GET', 'http://httpbin.org/robots.txt')
>>> r.status
200
>>> r.data
'User-agent: *\nDisallow: /deny\n'