The Engel classification system is a widely-used tool in the field of epilepsy diagnosis and classification. However, there are several synonyms that are commonly used to refer to this classification system, including the ILAE classification system, the International League Against Epilepsy classification system, and the 2017 epilepsy classification. These terms all refer to the same system, which classifies seizures and epilepsies based on their clinical features, EEG findings, imaging results, and other relevant factors. Other related terms that may be used interchangeably with Engel classification include seizure classification, epilepsy categorization, and epilepsy taxonomy. Regardless of the specific term used, the goal of these classification systems is to help clinicians make accurate diagnoses and choose the most appropriate treatment options for their patients.