Are vlcc ship and oil tanker the same?

No, a VLCC (Very Large Crude Carrier) is a specific type of oil tanker designed to transport large volumes of crude oil, typically ranging from 200,000 to 320,000 deadweight tons. While all VLCCs are oil tankers, not all oil tankers are VLCCs; there are various classes and sizes of oil tankers, including Aframax, Suezmax, and smaller tankers designed for different types of cargo and routes.