Ok, I'll bite. How did you "delete" terminal? Drag it off the dock? You can drag it back.
Why do you need terminal in the first place? If you have ever used Linux, you will feel right at home in terminal. If you're looking for dos, well, let me just say you're looking at a bit of a learning curve.
Terminal is located in /Applications/Utilities but you don't have to go there looking for it. Click spotlight and type term and hit enter. There are alternatives available to terminal. More here.
This is about as absurd as somebody saying "I deleted cmd and that's why I hate Windows and switched to Mac". But wait. There's nothing absurd about switching to Mac.