What is formed when many organs in your body work togther?
When many organs work together in co-ordination, an organ system is formed. examples are digestive system, circulatory system, etc.
Most organs in the human body serve a particular purpose, and many organs have more than one purpose. Some organs, like wisdom teeth and erector pili are essentially useless and are called vestigial. Other organs like the gall bladder or tonsils are useful, but not essential. Your question is a vague but just about every organ in the human body is essential for life.