Provided video introduces the definition of hernia, its common sites of occurance, different types of hernia and the various ways by which they can be classified and studied. Timeline: 0:00 - Definition of hernia 0:55 - Sites of hernia 1:21 - Inguinal hernias 1:51 - Femoral hernias 2:14 - Umbilical hernias 2:40 - Hiatus hernias 3:06 - Other hernia types (epigastric, paraumbilical, spigelian, diastasis recti, obturator, lumbar, incisional, muscle, gluteal, sciatic) 5:34 - Aetiology and risk factors 6:45 - Parts of hernia 8:20 - Different classifications of hernia 8:38 - Direct of indirect hernia 9:23 - Clinical classification 10:44 - Congenital/ acquired classification 11:14 - Classification according to the contents of hernia 12:05 - Classification based on sites