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Typically a graphical style where there are one two colors. (A bit can be either on or off, so two options) Commonly black and white, but can be any combination depending on the style the creator is trying to accomplish. 

A style of game where the player must click on something to earn points, which they spend on upgrades to increase the number of points they earn per click, or to increase the number of points they earn over a period of time without clicking.

Games that can be played using only a mouse or other pointing device, and don't require any other input.

A subgenre of the adventure game, point-and-click games typically involve interacting with background objects, talking to non-player characters, and using an item inventory to solve puzzles that allow the player to progress through the story.