What is a turbo jet engine?

It's a kind they only use on OLD military aircraft anymore.

A turbojet is a jet engine that moves the plane using only the thrust from the engine's exhaust. It is the least-efficient way to do it, so these days you only see it on antique tactical aircraft like P-3 Orions and KC-135 tankers.

The turbojet has been replaced by the turbofan engine. There's still a jet engine in there, but it drives a big fan at the front of the engine that pushes air around the engine case...the thrust the engine produces is a mixture of the exhaust from the engine and the wind from the fan. They have "low bypass" engines, where most of the thrust comes from the exhaust, and "high bypass" engines, where most of the thrust comes from the fan.