For anything Artificial Intelligence or Machine Learning, datasets are important and sometimes to tune the algorithms requires a dataset that is useful and valid.
One search tool that many use is called “GOOGLE” but there is a specific link to search for datasets.
https://datasetsearch.research.google.com/
Another site talks about the background of google search engine and other datasets that are available for Artificial Intelligence or Machine Learning projects.
Datasets such as these has led data scientists to explore new projects. For example, Parkinson’s datasets can be very useful for exploring data and patterns.