A Brain-Computer Interface (BCI) is a technology that enables direct communication between the brain and an external device. This innovative system translates brain signals into commands that can control computers, prosthetics, or other devices, offering new possibilities for individuals with disabilities. BCIs work by detecting electrical activity in the brain, often through sensors placed on the scalp. This information is then processed and translated into actionable outputs. As research advances, BCIs hold the potential to enhance cognitive functions and improve quality of life for many users, paving the way for a new era of interaction between humans and machines.