This question is rather general. Simply put, epilepsy is a generic term for a disease, and seizures are clinical symptoms of abnormal excitatory discharges of brain neurons, resulting in the corresponding functional areas of the cerebral cortex. Modern medical tests include EEG, magnetoencephalography, cranial MRI, functional MRI, PET, PETCT, neuropsychological assessment, etc. EEG has been described as the “gold standard for epilepsy diagnosis” because it has the advantage of recording the relevant nerve cell discharges, and is the first choice of most doctors. The EEG is the gold standard for the diagnosis of epilepsy because it has the advantage of recording the relevant nerve cell discharges, and is the first choice of most doctors, and is irreplaceable to other tests, but is by no means the only one, because so far, any test is an approximate description of epilepsy.