On the Web, what is a "dark pattern"?

On the Web, what is a "dark pattern"?

• A subtle way to manipulate the user.
• Another name for "dark mode".
• A pattern that reveals hacker activity.
• A type of encryption algorithm. 

EXPLANATION

Dark pattern In graphic and web design, a dark pattern is "a user interface that has been carefully crafted to trick users into doing things, such as buying insurance with their purchase or signing up for recurring bills." The neologism dark pattern was coined by Harry Brignull in August 2010 with the registration of darkpatterns.org, a "pattern library with the specific goal of naming and shaming deceptive user interfaces."

SOURCE

https://www.quora.com/What-are-some-subtle-ways-that-people-manipulate-each-other