LinkedIn is a social media platform for professionals. It allows you to network and to build your professional portfolio but also look for a new job. You can use LinkedIn to display your resume, search for jobs, and improve your professional reputation by posting updates and interacting with other people.
LinkedIn is free, but also there is a subscription version called “LinkedIn Premium” offers additional features like online classes and seminars, as well as insights into who's searching for and viewing your profile.
LinkedIn allows members (both workers and employers) to create profiles and "connections" to each other in social network which represent real world professional relationships.