Hosted or Cloud Jupyter notebooks are integrated development environments that provide a complete ecosystem for data science and machine learning. Cloud Jupyter comes with already installed and configured tools that you need to run analyses, train models and deploy APIs.
Other than free compute and pre-built environments, cloud notebook platforms offer third-party tool integrations, collaborations, and publication options.
There are a lot of Hosted Jupyter notebook platforms such as Saturn Cloud, Kaggle, AWS SageMaker, Google Colab, etc.