(1) A text file with embedded tags. See
tagged text and
XML.
(2) A multimedia file that contains a description of its content. See
metadata.
(3) Data identified for training AI systems. An image may be labeled if its file name is descriptive. However, the vast majority of data traversing the Internet is not identified in such a manner and unlabeled data is often labeled manually (see
data labeling). However, data can also be labeled by machine to provide greater amounts of input for training language models. See
large language model.