Identifying elements within a genome.

When annotating chess games, commentators frequently use widely recognized annotation symbols.

In the Java computer programming language, an annotation is a form of syntactic metadata that can be added to Java source code..

In molecular biology and genetics, DNA annotation or genome annotation is the process of describing the structure and function of the components of a genome, by analyzing and interpreting them in order to extract their biological significance and understand the biological processes in which they participate.

a free, open source, web-based image and video annotation tool used for labeling data for computer vision algorithms.

the practice and the result of adding a note or gloss to a text, which may include highlights or underlining, comments, footnotes, tags, and links.

Web annotation can refer to online annotations of web resources such as web pages or parts of them, or a set of W3C standards developed for this purpose.

(also known as automatic image tagging or linguistic indexing) the process by which a computer system automatically assigns metadata in the form of captioning or keywords to a digital image.