An electric jackhammer is a powerful, corded demolition tool using an electric motor to drive a piston, creating rapid, high-impact blows for breaking concrete, stone, or asphalt, ideal for indoor/smaller jobs lacking air compressors; it features a chisel bit, handles, and safety controls, often with variable speed and hammering/drilling modes, providing a portable, cleaner alternative to pneumatic models for construction, renovation, and plumbing work.