The difference between relative dating and absolute dating is that relative dating is a method of sequencing events in the order in which they happened.
Before radiometric dating (or other methods of absolute dating like counting tree rings) it was difficult to determine the actual age of an object.
Radiometric dating, based on known rates of decay of radioactive isotopes in objects, allows a specific age of an object to be determined to some degree of accuracy.
Your welcome for helping you with Biology Homework.... Both are attempting to get information on the history of events.
Tools like radiometric dating use radioactive isotopes and known decay rates… relative is determining the relative order of past events, without necessarily determining their absolute age.
Relative dating was a precursor to absolute dating.