The Titans in Greek mythology are a race of powerful deities who preceded the Olympian gods. They are considered primordial beings, including figures like Cronus and Rhea. Their fate was sealed after the great war, known as the Titanomachy, where they were defeated by Zeus and the Olympians. Following their defeat, most Titans were imprisoned in the Tartarus, serving as a reminder of the cosmic struggle between different generations of gods.