LinkedIn () is a business and employment-oriented service that operates via websites and mobile apps. Founded on December 28, 2002, and launched on May 5, 2003, it is mainly used for professional networking, including employers posting jobs and job seekers posting their CVs. As of 2015, most of the company's revenue came from selling access to information about its members to recruiters and sales professionals. As of March 2019, LinkedIn had 610 million registered members in 200 countries.
LinkedIn allows members to create profiles and "connections" to each other in an online social network which may represent real-world professional relationships. Members can invite anyone to become a connection. The "gated-access approach" is intended to build trust among the service's members. Since December 2016 it has been a wholly owned subsidiary of Microsoft. LinkedIn participated in the EU's International Safe Harbor Privacy Principles.