In computer interface design, to unclick is to deselect a specific preference,^[2][3] typically by tapping a selected checkbox with a finger or cursor. As a result, the check mark image or dark circle inside the box is removed.

As the Internet becomes an increasingly popular medium for marketers, vendors and marketers often presume that a user will prefer certain choices,^[4][5] such as receiving emails in the future, having specific computer settings, or preferring that specific programs will be operational when a computer is turned on. As a result, it is sometimes necessary for a user to unclick these choices^[6] to avoid exposure to unwanted advertising,^[7] or to avoid a situation in which a different website is chosen for one's home page.^[8]

In Internet marketing, unclicking is often required for a user to avoid being billed automatically for unnecessary services, sometimes part of a deceptive business practice termed negative option billing. A user's Facebook privacy settings have often been chosen in advance by Facebook Inc., which presumes that a user would like particular settings, and to un-choose these options, a user may need to unclick or opt-out of the Facebook-determined choices by finding the right menus.^[9] According to behavioral economics, computer and Internet users have a general tendency to go along with a default setting.

The term unclick has also been used in other contexts, such as when there is a latching or locking mechanism, such as a lock on a briefcase,^[10] or seat belts in a car^[11][12] or airplane,^[13] or door lock,^[14] or other mechanisms which typically make a "clicking" sound. In these contexts, unclicking means to open the latch or seat belt. It has also been used in the context of guns, in which a safety catch is "unclicked",^[15] or flooring materials in which pieces are interlocked,^[16] The term has been used to describe the act of answering a cell phone by pressing on a button when it is ringing.^[17]