Germ cell tumors are a type of cancer that originates from germ cells, which are the cells responsible for producing sperm and eggs. These tumors can develop in various parts of the body, including the testes, ovaries, and mediastinum. They can be classified into two main categories: seminomas and non-seminomas, each with different characteristics and treatment approaches. These tumors can occur in both children and adults, but they are more common in young men. Symptoms may vary depending on the tumor's location and type, but they often include swelling or a mass in the affected area. Early diagnosis and treatment are crucial for improving outcomes.