So what the heck is a traditional ship burial. Sounds like something out of Monty Python
It does indeed mean burial in a complete ship, together with your weapons, other prize possessions and supplies for your journey to the underworld. It was the privilege of kings and other rich men in the Germanic countries, but particularly by Viking Age Norsemen. Viking equivalent of the Pyramids of the Pharaoh.
One of the most spectacular was an Anglo-Saxon burial in Eastern England, discovered in the 1940s. which contained one of the most important hordes of artefacts ever found from that period.
There were even ship burials for queens and other women of rank. One found in Norway contained the enigmatic inscription 'Man knows nothing'. (Which can be read in several different ways in Old Norse as well as modern English!)