Gaslighting occurs when there is an imbalance of power, and therefore you may experience it with your manager. Manipulation and deception can also come from your peers.
Siahaan, who has a Master's degree in Human Resource Management, says, "Gaslighters can be a client or condescending co-worker. They can also be a workplace frenemy who is jealous of your success."
A gaslighter plants seeds of doubt about your competence and credibility, weakening your confidence and morale. They may rely on external reinforcement to be effective, as Professor Kate C. Adkins writes in her paper "Gaslighting by Crowd" in Social Philosophy Today.
"An individual who makes their co-worker feel unskilled and mentally off may do so to appear competent in the eyes of the supervisor," Siahaan explains.