A sperm donor is a man who provides his sperm to help individuals or couples conceive a child. This process is often used by those who may have difficulty conceiving naturally, such as single women, same-sex couples, or heterosexual couples facing infertility issues. Sperm donors can be anonymous or known, depending on the arrangement made with the recipient. Sperm donation typically occurs through a sperm bank, where the sperm is collected, tested for diseases, and stored. Donors usually undergo a screening process to ensure they are healthy and meet specific criteria. The donated sperm can then be used in various fertility treatments, such as intrauterine insemination (IUI) or in vitro fertilization (IVF).