Jupyter is an umbrella project for different software tools.

A single file in JupyterLab is often referred to as a Jupyter Notebook. Originally, it was the first editing tool before the release of JupyterLab.

A JupyterHub runs in the cloud environment and is assigned directly to an existing Moodle course.

The JupyterLab is the web-based interactive development environment for Jupyter notebooks, code (most often in Python or R), and data, including data visualization. A JupyterLab is always user-specific.