A more thorough explanation:

A biological father is a male parent who has contributed his genetic material to the conception of a child. This means that the child shares half of their DNA with their biological father.

For example, if John is the biological father of Sarah, it means that Sarah has inherited half of her genetic material from John. This can be determined through DNA testing.

It is important to note that a biological father may not necessarily be the same as a legal or acknowledged father. A legal father is a man who has been recognized by law as the father of a child, regardless of whether he is the biological father or not.

For instance, if a man adopts a child, he becomes the legal father of the child even if he is not the biological father. On the other hand, an acknowledged father is a man who has admitted to being the biological father of a child born to unmarried parents.

Overall, the term biological father refers to the male parent who has contributed his genetic material to the conception of a child.