Hello aspirant,

Automobile is a sub-part of mechanical engineering. Basically mechanical engineering can be categorized into four parts - Manufacturing, Designing, Thermal and Automobile. In Automobile engineering you will learn about Automobile IC engines, Vehicle Dynamics, Vehicle kinematics, etc, thus having more automotive oriented approach. Automobile sector is now expanding.  It's a vast Branch having many opportunities. So here you have choices to choose. Like thermal , solar , hydro etc. Many govt. Jobs are also there in mechanical engineering.  

Hope you get your doubt is clear.

Thank you!!