Annotation means to make notes either on a paper document or an electronic file such as a spreadsheet, word processed document etc.
The annotation is used to provide an explanation about something.
For example, you might annotate your work to explain why you chose to use a certain font style or size or why you incuded a particular image.
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Annotation