1. Gaslighting, a psychological manipulation tactic, involves influencing others to question their own sanity.2. The term originates from the 1944 American movie "Gaslight," where a husband manipulates his wife by adjusting the gaslights in their home to flicker, while also bribing the servants to deny any changes. This leads the wife to question her own memory and logic, eventually making her believe she is going mad.3. Gaslighting is a form of psychological abuse where the abuser deliberately provides false information, causing the victim to doubt their own sanity.4. This manipulation is widespread in everyday life. For instance, passive-aggressive individuals often possess a key "skill"—shifting blame and taking credit.5. They have a strong sense of self-protection and tend to create excuses to avoid responsibility. Often, they will attribute causes to others when things go wrong and take credit for successes.