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 donor's sperm is collected, tested for quality and genetic diseases, and then stored. Recipients can choose a donor based on various factors, including physical characteristics, ethnicity, and medical history, to find a match that meets their preferences.