Hi Aspirant,

B.COM (Bachelor of Commerce)and BBA(Bachelor of Business Administration) both are undergraduate courses.

B.Com is a general course in Commerce after which you can go for almost  any Master's degree in Commerce field

whereas

BBA is generally meant to be done when one wants to persue a MBA(Master of Business Administration) or PGDM(Post Graduate Diploma in Management) after it. 

Though you can go for MBA even after B.Com 

And both these Undergraduate dergrees are usually not required simultaneously. Either one does B.com or BBA and not both together .

Hope,I'm able to help you.

Thank you.