Virtual Environment for Python Django
Well, this is one of the most common questions among beginners. I, myself have faced the question and did build multiple projects without worrying about the virtual environment.
But, of late, I have realized the importance of using virtual environments. Some of the benefits of using virtual environments are:

Dependency Management: Prevent conflicts between dependencies of multiple projects.
Ease of installation and setting up new project on different machines: Store your dependencies in requirements.txt file and run 
pip install -r requirements.txt to install the dependencies wherever you want.
I'm currently a novice in web programming. I've been working on this Django project lately, and I've been reading about virtual environments. At the start of my project, I was unable to set up a virtual environment, and so I proceeded with the project without it. My questions are
Whether or not this virtual environment is really necessary?
If I want to make more Django projects in the future, will I need this virtual environment to differentiate the projects since right now I'm running all the commands in the command prompt from my main C: directory?
Does this virtual environment differentiate multiple projects or does it separate each project with respect to the version of Django/Python it's coded with or both? I'm wondering because I currently input commands such as python manage.py runserver (without the virtual environment) in my main C:drive directory. So does that mean I can't do multiple projects at once without a virtual environment for each? Can I still work on multiple projects without a virtual environment? (I've been confused about this especially)
Should I just try to set up a virtual environment for my next project or can I still do it for this current one (I'm halfway through the project already, I've already made models, views, templates, etc.)? 
Any answers to clarify my confusion is greatly appreciated!