Pip is the python equivalent of "linux redhat's yum"
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It comes included with python 3.4.
it is something that you run from the powershell command line rather than within python terminal itself, e.g.
PS C:\Users\Mir\Desktop=> pip install -U selenium
Running setup.py (path:C:\Users\Mir\AppData\Local\Temp\pip_build_Mir\selenium\setup.py)
egg_info for package selenium
Installing collected packages: selenium
Running setup.py install for selenium
Successfully installed selenium