Seizures and epilepsy are related but distinct terms.
A seizure is a sudden, uncontrolled electrical disturbance in the brain. This creates a change in behior or sensation and may cause a loss of awareness or consciousness. Hing a seizure by itself does not mean a person has epilepsy. Rather, they can occur as a one-off event or as part of another condition.
Meanwhile, epilepsy is a neurological disorder that involves recurring seizures. It is sometimes known as seizure disorder. Seizures associated with epilepsy can vary in type and severity, and it is a long-term condition that requires ongoing management. It is usually diagnosed after a person has two or more unprovoked seizures.