A diver is a person who swims underwater, often using special equipment to breathe and see clearly. Divers can explore oceans, lakes, and rivers, and they may engage in activities like scuba diving, free diving, or snorkeling. Each type of diving has its own techniques and equipment, such as tanks for breathing or masks for visibility. Diving is not only a recreational activity but also a profession. Many divers work in fields like marine biology, underwater photography, or search and rescue. They may also participate in scientific research to study marine life and ecosystems, contributing valuable information about underwater environments.