We will be using Google Colaboratory to run Python code. All you need is a Gmail account to sign in.
Colaboratory, or “Colab” for short, is a product from Google Research. Colab allows anybody to write and execute arbitrary python code through the browser, and is especially well suited to machine learning, data analysis and education. More technically, Colab is a hosted Jupyter notebook service that requires no setup to use, while providing free access to computing resources including GPUs.
More FAQs here: https://research.google.com/colaboratory/faq.html
A Google Colaboratory notebook is a web-browser interface for running Python code. You don't have to download and install Python on your computer to use it because it compiles code on an online server. It is an interface where you can integrate code, visualizations, and explanatory text.