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Gaslighting is a form of psychological manipulation where someone makes another person doubt their own perceptions, memories, or sanity. The term comes from the 1938 play *Gas Light*, where a husband dims the gas lights and denies it, causing his wife to question her reality. It often involves tactics like denying events, trivializing feelings, or shifting blame to make the victim feel confused or insecure. For example, if you confront someone about a hurtful comment and they insist, "I never said that, you're imagining things," that's gaslighting. It’s about control, eroding trust in oneself. If you want deeper context or examples, I can dig into posts on X or web sources—let me know.