What's the Difference Between Terrarium and Terrarium?

A vivarium is a tank that's used to study animals specifically. A terrarium is just decorated nicely, whereas if a vivarium isn't, it just creates the conditions. Why do people keep pets? Well, because pets are good company, they add to the general ambiance. And be in this environment? Well, actually I said ambiance, but I think the word is ambiance.Ambiance... No idea what that is actually. It's like the general atmosphere in a house or like... Yes, it is the atmosphere,. If you want to have words for atmosphere, then just say ambiance and people will understand you.