What is supervised learning?

If you don't study hard, you need someone to watch you study.

Classification is often said, through the existing training samples, that is, the known data and its corresponding output, to train and get an optimal model, which belongs to a group of functions.

Optimal means to be optimal under certain evaluation criteria, and then use this model to map all inputs into corresponding outputs, make simple judgments on the outputs, achieve the purpose of classification, and also have the ability to classify unknown data.