A biological father is a man who contributes genetic material, specifically sperm, to the conception of a child. This means he is the child's natural parent, sharing half of the child's DNA. The biological father plays a crucial role in the child's genetic makeup, influencing traits such as physical appearance and certain health conditions. In many cases, the biological father may also be involved in the child's upbringing, but this is not always the case. A biological father can be different from a child's legal father, who may be the man recognized by law as the child's parent, regardless of biological connection.