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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.
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.
Relative dating was a precursor to absolute dating.
Before absolute dating techniques were discovered, the age of a rock was a guesstimate at best.
Absolute is the process of determining an approximate computed age in archaeology and geology.
Short Answer: Radiometric dating is one type of method used in absolute dating.
By deducing which fossils are formed in the sequence of time, the periods when the particular fossilized entities existed can be arranged in order without the actual dates of when the fossils were laid down.
Relative dating is a scientific process of evaluation used to determine the relative order of past events, but does not determine the absolute age of an object.
The circumstances of the object may allow one to say that one object is older than another without being able to assign a particular age to the objects.
Absolute dating of rock is achieved by radiometric dating techniques.
Relative dating is achieved by determining the position of rock in strata, and the appearance of certain index fossils.
However, carbon dating is an absolute dating technique that can give an estimate of the actual age of an artifact and thus an estimate of the age of other objects in the same layer.