Mollies are small, colorful freshwater fish belonging to the family Poeciliidae. They are popular in home aquariums due to their peaceful nature and ease of care. Mollies come in various colors and patterns, including black, orange, and speckled varieties. They thrive in warm, well-maintained water and can grow up to 4-5 inches in length. These fish are livebearers, meaning they give birth to live young rather than laying eggs. Mollies are often kept in community tanks with other species like guppies and tetras. They require a balanced diet that includes both plant and protein-based foods to stay healthy.