ECT is a treatment where seizures are electrically induced in anesthetized patients to treat various mental disorders like severe depression, mania, and catatonia. It involves administering 6-12 treatments over several weeks and was first widely used in the 1940s-50s. ECT has three main variants that differ in electrode placement, stimulus duration, and properties which impact side effects and outcomes. While it effectively treats severe depression in the short and long-term, side effects can include confusion and memory loss around the treatment period. Informed consent is now required for ECT, and involuntary treatment is rare outside life-threatening situations.