EEG is a medical technique that records electrical activity in the brain. It involves placing electrodes on the scalp to detect and measure the electrical impulses produced by brain cells. Electrodes attached to the scalp pick up electrical signals generated by the brain’s neurons. These signals are then amplified and recorded by an EEG machine, creating a visual representation of brain activity, often shown as waves on a monitor or printout. EEG is commonly used to diagnose epilepsy by identifying seizure activity, assessing sleep disorders, monitoring brain activity during surgery, and investigating other neurological disorders.