DARK PATTERNS

Have you ever heard about dark patterns? I never heard about this term in till, my English teacher told us about it. It's when you go shopping online and see that people are in the same page or their are there are only a couple of these products. They tempt you to buy them because other people want it. They use dirty tricks to lure you into buying things. They sell your information. I shop online and sometimes I would see that it would show me other people are seeing the same product as me. They want me to buy it. I would see how many people are looking at it but then exit the page because I don't like it when it would tell how many people are looking at same the websites. I start to get insecure. I don't know why but I do.