This document provides an overview of hernias, including their classification and types. It discusses internal hernias such as hiatal, para duodenal, and mesenteric hernias. External or groin hernias like inguinal and femoral hernias are also covered. Inguinal hernias are the most common type worldwide. The document outlines the anatomy of the inguinal canal and classifications of direct and indirect inguinal hernias. Causes, stages, management, surgical procedures and potential complications of hernias are summarized.