Electroencephalography (EEG) is a medical technique used to record electrical activity in the brain. It involves placing small electrodes on the scalp, which detect and measure the electrical impulses produced by neurons. This information is then displayed as waveforms on a computer screen, allowing doctors to analyze brain function. EEG is commonly used to diagnose conditions such as epilepsy, sleep disorders, and brain injuries. It is a non-invasive procedure, meaning it does not require surgery or any insertion into the body. The results can help guide treatment options and monitor brain health over time.