Sperm are the male reproductive cells found in many animals, including humans. They are tiny, usually shaped like a tadpole, and their main job is to fertilize the female egg, or ovum. Each sperm cell carries genetic information from the male, which combines with the female's genetic material during reproduction to create a new organism. In humans, sperm are produced in the testes and travel through the reproductive system to be released during ejaculation. A healthy sperm count is important for fertility, as it increases the chances of successfully fertilizing an egg. Understanding sperm is essential for studying reproduction and genetics.