Noun
Anything that is provided or furnished by an environment to an organism dwelling within it, whether good or bad.
(human-machine interaction) A potential transaction or operation that is made possible by a given object or environment; especially, one that is made easily discoverable.
(graphical user interface, by extension) Any interactive control or component serving as a cue to the user to take some action.
The grab handles on the edges of this image are affordances that the user can exploit to change the size of the image.
Enabled to learn as children might, a model was created based on an affordance model in which mappings between actions, perceptions, and effects were created and linked to spoken words. Source: Internet
Common touchscreen gestures include: Drawbacks A major drawback of current gesture interaction solutions is the lack of support for two necessary user interface design principles, feedback and visibility (or affordance ). Source: Internet