A professional network service (or, in an Internet context, simply professional network) is a type of social network service that is focused solely on interactions and relationships of a business nature rather than including personal, nonbusiness interactions.Notable examples include LinkedIn, Viadeo, XING, Ownmirror, Open Science Lab, Wisestep.com, C-Profs.com, and Hall.com.A professional network service is used by business individuals to establish and maintain professional contacts and a way to either find work or get ahead in career as well as gain resources and opportunities for networking.