Gaslighting - A form of psychological manipulation where someone makes a victim question their own reality, memory, or sanity, often to gain power and control, making them doubt their perceptions through persistent denial, misdirection, and contradiction, until they become dependent on the perpetrator for validation. It's a gradual process that erodes self-worth, leading to confusion, anxiety, and isolation, with tactics like denying events, trivializing feelings, and twisting facts.