Collaboratory, 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.
This utility allows you to run source code that requires online hardware resources using your google account.
This way you can test demanding modules like the python TensorFlow module.
The utility is free but you can pay extra for more hardware resources.
Colab notebooks are stored in Google Drive, or can be loaded from GitHub.
The types of GPUs that are available in Colab varies over time. This is necessary for Colab to be able to provide access to these resources for free. The GPUs available in Colab often include Nvidia K80s, T4s, P4s and P100s.
You can see a simple intro with a notebook on my GitHub account.