Dark Patterns are tricks used in websites and apps that make you do things that you didn't mean to, like buying or signing up for something.
HOW DO DARK PATTERNS WORK?
When you use websites and apps, you don’t read every word on every page - you skim read and make assumptions. If a company wants to trick you into doing something, they can take advantage of this by making a page look like it is saying one thing when it is in fact saying another. You can defend yourself by learning about Dark Patterns on this site: