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Data annotation is a term to describe the labeling of data. Different types of data get annotated in different ways. Text strings can be labeled with various common annotations, where image data is often annotated with colored lines or other markers.
The idea of data annotation plays into one of the main concepts in machine learning and data science, which is called “labeled data.” Labeled data allows machine learning and data science programs to work from pre-existing classifications and inputs.
Data annotation serves to introduce the labeled data to the system and works in various other technologies contexts as well.