An ejection port is a small opening in a firearm's breech face that allows spent shells to be removed from the firearm's chamber after firing. This opening is typically located on the side of the firearm, just above the trigger guard. After the cartridge is fired, the pressure from the burning propellant forces the empty shell casing out of the chamber and through the ejection port. The ejected casing is then caught by an extractor, which holds it in place until it can be manually removed from the firearm. Ejection ports are an essential part of modern semi-automatic and automatic firearms, as they allow for cartridges to be rapidly and efficiently removed after firing. This process also helps keep the firearm's chamber clean and free of debris, which can impede its operation. Additionally, ejection ports provide visual confirmation that a cartridge has been fired, ensuring that a firearm is safe to handle and reload.