Brain chips are implantable computer chips that can be placed in the brain. They consist of both biological and electronic components and can enhance memory, help paralyzed patients control devices, and potentially be used for military purposes. A key technology is Braingate, which uses a tiny chip with 100 hair-thin electrodes implanted on the motor cortex to detect brain signals and allow severely disabled people to control external devices like computers. The brain signals are transmitted to software that analyzes and translates them so patients can perform tasks like moving a cursor or prosthetic limb with their thoughts. While promising, brain chip technology is still in early stages with challenges around refining the interface between biological and artificial systems.