What is the guild system

Guilds were trade associations in the Middle ages. There were three distinct ranks or levels of Craftman: Apprentice, Journeyman, and Master. The Master headed up the shop, studio, etc, and owned the shop as well. as stated there were three definite ranks,. this is somewhat similar to the three principal enlisted Army ranks of Private, Corporal, and Sergeant, but there are degrees of each, such as PFC, master Sgt, etc. This has ( Guild class structure) nothing to do with video games and indeed such a frivolous activity- and violent at that should not be in the same breath with the tradition-minded Guild structure. One cannot apply master-craft standards to something like Donkey Kong, space invaders, Grand Theft Auto, yecch!