A laparotomy is a surgical procedure involving an incision through the abdominal wall to access the abdominal cavity. It can be performed for both diagnostic and therapeutic purposes when there is a need for surgery but no definitive pre-operative diagnosis. The key steps include pre-operative preparation, gaining surgical access, systematically exploring the abdominal cavity including solid organs and intestines, performing any necessary procedures, and closing the abdominal wall. Complications can include infection, adhesions, hernias and more, so thorough exploration and drainage if needed is important.