LinkedIn is the world's largest professional network with over 65 million members in over 200 countries. It allows professionals to connect, find career opportunities, and discuss issues relevant to their jobs. A new member joins approximately every second, with half of members living outside the U.S. LinkedIn is commonly used by hiring managers to research and source job candidates, with 75% using it for candidate research and 66% for candidate sourcing. Creating a free LinkedIn profile is straightforward, while premium memberships provide additional benefits such as viewing profiles and sending messages to non-connections.