While ESO is part of the Elder Scrolls universe, it is both very different and very similar to games like Skyrim. You'll still feel that awe of reaching the highest peak and looking over the vast horizon, but this time you may not have gotten there on your own (or with Lydia).

Is The Elder Scrolls Online different than Skyrim?

The biggest difference is that Elder Scrolls Online is an MMO and Skyrim is a single player RPG. In Skyrim, you can play without an internet connection. You just create a character, and explore a world where you are the only real player.

Does ESO feel like an Elder Scrolls game?

Actually ESO feels more like ES:Daggerfall and is closer to Morrowind as Skyrim (though I love Skyrim). This is something I like a lot. Elder Scrolls was always about a incredible huge world with a lot of lore hidden and tons of things to explore. ESO caters everything for me.