Your job as a business development manager is to identify sales leads, pitch goods or services to new clients and maintain a good working relationship with new contacts.
This role revolves around good communication and so whatever business you work in your duties are likely to include:
Following up new business opportunities and setting up meetings
Planning and preparing presentations (say hello to Powerpoint)
Communicating new product developments to prospective clients
Overseeing the development of marketing literature
Providing management with feedback