MBA can be done in various specializations like Finance, Marketing, HR, Operations etc..
The domain has to be chosen by you as per your interest.

MBA in HR: The Human Resource Management is a function that involves in the process of hiring of the workforce, providing development & training, maintaining workforce regulation, assessment of their performance, providing compensation & benefits, motivating, relation with labour, health, welfare and safety assessment.

MBA in Marketing: An MBA in Marketing has become one of the most desired degrees by both students and employers in recent years. With the shift to digital and online marketing, most businesses now have their own, in-house marketing teams that specialize in bringing traffic and customers to the company. While there are a number of specific areas of marketing, an MBA in marketing doesn't limit the degree holder to pursuing marketing careers alone. The skillset can be put towards dozens of other career options, from consulting to entrepreneurial management.

MBA in Finance: For those seeking a career that deals with money, an MBA specialization in finance can prove to be invaluable. It is a career field which requires one to possess skills in mathematics, economics, and financial theory, all of which are covered in great detail in a finance degree, specialization or track. An MBA in finance balances mathematical rigor with management classes, and can be a good way to direct your career towards jobs in finance.

For getting into MBA, you need to clear entrances like CAT, MAT, XAT, NMAT, CMAT etc.. to get into the above fields of MBA.

Some of the top MBA colleges to pursue your specialization are:

IIM A
IIM B
IIM C
XLRI
IIM L
MDI Gurgaon
DoMS
IIFt
FMS, DU

you can even check the complete list here.

Also the ranking and rating of the college has been given in the link above.
Good luck!!