The Nereids are sea nymphs in Greek mythology, known as the daughters of the sea god Nereus and the ocean goddess Doris. There are fifty Nereids, each representing different aspects of the sea, such as waves, currents, and marine life. They are often depicted as beautiful young women who assist sailors and offer guidance during storms. In mythology, the Nereids are associated with the Mediterranean Sea and are known for their kindness and helpfulness. They frequently appear in various myths, including the story of Achilles in the Iliad, where they help him in his quest for glory.