Everything to know about LinkedIn, the popular professional networking and career development site owned by Microsoft

LinkedIn is Microsoft's popular social-networking site for professional and career development.

Jakub Porzycki/NurPhoto via Getty Images

• LinkedIn is a social network for professional networking and career development.
• Microsoft acquired LinkedIn nearly a decade ago for a whopping $26.2 billion in cash.
• LinkedIn is free, but a subscription version called LinkedIn Premium offers additional features.

Like Facebook, Instagram, Twitter, and a dozen others, LinkedIn is a social network.