original source : https://youtu.be/N5vscPTWKOk
pip :
Pip is a package management system used to install and manage software packages, such as those found in the Python Package Index.
vitualenv :
virtualenv is used to manage Python packages for different projects. Using virtualenv allows you to avoid installing Python packages globally which could break system tools or other projects. You can install virtualenv using pip. 각각의 project별로 필요한 dependencies가 다르므로 각기 다른 환경에서 작업 할수 있게 해주는 도구이다.
참고사항 : https://youtu.be/nxOPY1eFL9A
