BD (Business Development) refers to the business development personnel who are mainly responsible for communicating and maintaining relations with operators. BD is responsible for communication with operators, including the declaration and promotion of new services. They need to understand the needs and requirements of operators, provide appropriate business solutions and negotiate cooperation with operators. Including effective communication with the business departments and technical departments of operators to ensure the maximum benefits of both parties. BD also plays an important role in public relations. They establish and maintain good relations with the responsible persons of operators to promote business cooperation and development. This includes meeting regularly, exchanging cooperation opportunities, solving problems and providing support. By establishing trust and cooperation, BD can better understand the needs of operators and provide them with better services and solutions.