What the is Difference between Business Development and Sales management in professional life?

Business developmnet involves more aspects of interaction between a client and a producer rather than just the sales function. BDM should not only be able to attract new customers and sell the products, but also retain these customers, develop their loyalty to the company and its products, encourage them to advocate the brand..

I would suggest that a proper BDM should be at a time a good marketing, sales and CR manager, he should know how to develop long term strategies and move the business forward.

in short:

Difference is simple: in business development, you are convincing people to make a decision they don’t have to make, Generating Business with your skills, while in sales, you’re convincing people to make a decision they have to make. Closing deals.