pip is a package management system used to install and manage software packages written in Python. Many packages can be found in the Python Package Index (PyPI). It is important for the future to install any python package.
To install or upgrade pip, first download get-pip.py. After it downloaded, run the following command in terminal "python get-pip.py". (don't forget as administrator access). Pip required setuptools package, if it is not already installed, get-pip.py will automatic install it.
Or for more simple install, you can use package manager using command "sudo apt-get install python-pip" (for Ubuntu).
To use pip command, just simple command "pip install package-name". For this example, it is sample command to install virtualenvwrapper.