Facebook is a social media platform where users can create profiles, connect with friends, and share content like photos, videos, and messages. Launched in 2004 by Mark Zuckerberg and his college roommates, it enables people to communicate, join groups, and follow pages of interest. Facebook has evolved into a major tool for businesses and advertisers, allowing targeted marketing. It has faced criticism over privacy issues and the spread of misinformation but remains a significant part of social interaction and communication in the digital age, boasting billions of active users worldwide.