Data Annotation

What Does Data Annotation Mean?

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.


Techopedia Explains Data Annotation

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.


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Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.