Poecilia is a genus of freshwater fish commonly known as guppies and mollies. These small, colorful fish are popular in home aquariums due to their vibrant colors and ease of care. They are native to warm waters in North and Central America, as well as parts of the Caribbean. Members of the Poecilia genus are livebearers, meaning they give birth to free-swimming young rather than laying eggs. They thrive in various water conditions and are often used in scientific research due to their rapid reproduction and adaptability.