The long list of Elder Scrolls games help build upon the infrastructure in the different chapter and dlc lists that are available. The purpose of having written information about the different games also help understand when an abbreviation is seen throughout the web players can piece together what game is best suited for their life

TES is abbreviated as The Elder Scrolls and gives better understanding of Elder Scrolls Online that is the basic knowledge for all Elder Scrolls games known online hence a word understood as a literal or relation to another game chapter such as Daggerfall and Morrowind. The chapter in Morrowind has two games both online and offline game play

TESO is another abbreviation that has two basic meanings such as a game available to play online and some sales aspect to the abbreviation. The information in here provides more knowledge about the term rather trying to sell a game series; however the purpose is to learn what the abbreviations mean in order to understand a term in Elder Scrolls

Hopefully you have learned a little more about TES for better understanding of the different games in Elder Scrolls