Almost everything in ESO can be played solo with the exception of 12 player Trials and some of the more difficult veteran hardmode dungeons. I do recommend checking out the Can you play ESO Solo Guide which goes into detail what you can do as a solo player in ESO (Elder Scrolls Online). ESO is one of the most solo friendly MMOs out there currently. The main focus of ESO is the story content which can be played solo. Of course, if you wish you can also bring a buddy along with you.
Can you play ESO Solo? Elder Scrolls Online Solo
About the Author: Alcast
Alcast is a long-time gamer and specializes in build creation for certain games, especially MMOs. Alcast is most well known for his ESO (The Elder Scrolls Online) content. He has built popular brands like Alcasthq.com, ESO-Hub.com and Gameslantern.com. Favorite game IPs: Halo, XCOM, Total War, Mass Effect, Dragon Age, The Elder Scrolls and Warhammer.