A biological parent is the person who contributed to the child's genes, and in the case of the mother, carried the child during a pregnancy. A biological parent can, but doesn't have to be a legal guardian of the child.
An adoptive parent is did not directly contribute to the child's genes, but took over the care of the child after the child's birth. An adoptive parent is always a legal guardian of the child and maintains the contact with the child after their maturity.
A foster parent takes care of the child for some time, but is not always the legal guardian. A foster parent is who takes care of the child while the child waits for adoption,
