What is the main difference between turbojets and rocket engines is the fact that?

The main difference between turbojets and rocket engines is that turbojets rely on atmospheric oxygen to combust fuel, while rocket engines carry both fuel and an oxidizer, allowing them to operate in the vacuum of space. Turbojets are primarily used for aircraft propulsion within the atmosphere, whereas rocket engines are designed for high-altitude and space travel. This fundamental distinction affects their design, efficiency, and operational environments.