Difference relative dating absolute dating
In archaeology, absolute dating is usually based on the physical, chemical, and life properties of the materials of artifacts, buildings, or other items that have been modified by humans and by historical associations with materials with known dates (coins and written history).
One of the most widely used is potassium–argon dating (K–Ar dating).
The technique often cannot pinpoint the date of an archeological site better than historic records, but is highly effective for precise dates when calibrated with other dating techniques such as tree-ring dating.
An additional problem with carbon-14 dates from archeological sites is known as the "old wood" problem.
To say it in a few words, you may use relative dating for analytical work, But you will need absolute dating for the final synthesis.
Absolute dating is the process of determining an age on a specified chronology in archaeology and geology.