Episiotomy is a cut or incision made between the vagina and the anus (this area is called the perineum) to help deliver the baby in case of a complication arising during birth. This procedure enlarges the vaginal opening and the cut or incision can be made vertically or at an angle based on what your doctor recommends.
Sources:
https://www.mayoclinic.org/healthy-lifestyle/labor-and-delivery/in-depth/episiotomy/art-20047282
https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/episiotomy
https://www.nhs.uk/pregnancy/labour-and-birth/what-happens/episiotomy-and-perineal-tears/
https://www.healthline.com/health/pregnancy/episiotomy-types