Learn how to use Python virtual environments in this step-by-step tutorial. We explain what a virtual environment (venv) is, why it matters, and how to set it up on Windows, Mac, and Linux. Virtual environments help manage projects, avoid package conflicts, and keep development organized. In this video you’ll learn: - What happens when you install Python (interpreter, libraries, environment variables) - How to create a virtual environment with python -m venv - How to activate and deactivate venv on Windows, Mac, and Linux - How to check which Python interpreter is being used (which python3 , where py) - How to save dependencies with pip freeze - How to rebuild environments with pip install -r Why use venv? Real-world projects often use many packages, each with different versions. Updating one can break another, and sharing projects can be tricky if others don’t have the same setup. Virtual environments fix this by isolating dependencies per project. Keywords: Python venv, Python virtual environment, create Python venv, pip install, Python tutorial, Python environment setup, Python dependencies, , Python Windows, Python Mac, Python Linux. Whether you’re just starting Python or want cleaner workflows, this video shows you how to use venv with confidence.