Dark patterns are user interfaces designed to trick users. They were coined by Harry Brignull in 2010 to describe deceptive designs used to manipulate user behavior for commercial gain. Examples include bait-and-switch interfaces that advertise one thing but deliver another, trick questions that confuse the user's intentions, and sneaking extra purchases into online shopping baskets through opt-out options. Users are encouraged to identify and share examples of dark patterns online to increase transparency and honesty in design.