What Does Labeled Data Mean?

Labeled data is a designation for pieces of data that have been tagged with one or more labels identifying certain properties or characteristics, or classifications or contained objects. Labels make that data specifically useful in certain types of machine learning known as supervised machine learning setups.

Techopedia Explains Labeled Data

In supervised machine learning, labeled data acts as the orientation for data training and testing exercises. The supervised machine learning program may start out with a set of entirely labeled data, or it may use initial labeled data to work with additional unlabeled data.