Functional Magnetic Resonance Imaging, or fMRI, is a non-invasive imaging technique used to measure and map brain activity. It works by detecting changes in blood flow to different areas of the brain, which indicates which regions are more active during specific tasks or in response to stimuli. This allows researchers to study brain functions related to cognition, emotion, and sensory processing. fMRI is widely used in both clinical and research settings. In clinical applications, it can help diagnose conditions like stroke or tumors, while in research, it aids in understanding complex processes such as memory, decision-making, and language.