Business networking is establishing mutually beneficial relationships with other business people and potential clients to help grow a business. It has advantages like being inexpensive compared to other marketing methods, helping find partners, and allowing for convenient international connections. The document provides tips for building an international business network online such as joining international groups, interacting with contacts, understanding cultural differences in networking, and leveraging existing networks like LinkedIn. Specific international networking platforms are also mentioned. Lastly, it discusses differences between Chinese and American professional networks in terms of blending personal and business relationships.