What is the difference between a bachelor?

The question is incomplete. "What is the difference between a bachelor...?" needs a second item for comparison. To answer, please complete the question. For example:

* What is the difference between a bachelor and a master's degree?

* What is the difference between a bachelor and a married man?

* What is the difference between a bachelor and a spinster?

Once you provide the complete question, I can give you a helpful answer.