If you're working with a company you may have security concerns when using this tool, but it makes it so easy to install packages that you may need (such as plotly). Go ahead and type 'pip install sklearn' in the Anaconda console or in the Linux Bash and it does the work for you. Then you can just import the package easy.
It is pip for python through which gateway to millions of libraries for python is opened.It makes installation of library of python much easier.By just typing "pip install lib_name" in command prompt downloads the library with its all requirements in a single click.Also upgrading and removing is easy using pip.It is the library without which other library installation would have been a nightmare.