Brain-computer interface is a research field and technological concept focused on developing direct communication pathways between the brain and an external device, bypassing the body's normal neuromuscular output. It investigates methods for acquiring, analyzing, and translating neural signals into commands or feedback, typically involving the recording of brain activity (e.g., electrical, metabolic) and sophisticated algorithms to interpret these patterns for purposes such as controlling prosthetics, restoring communication, or enhancing human-computer interaction. This field is significant for its potential to restore function in individuals with severe motor disabilities and to advance fundamental understanding of brain function.