The Delta-class is a type of nuclear-powered submarine used by the Russian Navy. It was designed during the Cold War and first entered service in the 1980s. These submarines are primarily equipped for strategic deterrence, carrying ballistic missiles that can strike targets at long distances. Delta-class submarines are notable for their distinctive shape and size, which allows them to operate stealthily underwater. They are part of a larger family of submarines, including the Typhoon-class and Borei-class, each serving different roles within the Russian naval fleet.