A mark may refer to any of the following:
A mark is an ability for software to change the look or appearance of an object once a user views its contents. Marks are helpful because they allow users to what they’ve viewed or help them to find that object at a later time.
When referring to HTML, the tag is used to highlight a section of text.
Mark can also be an abbreviation for the Manchester Mark 1 computer.
Checkmark, Highlight, Software terms