Social networking sites are online platforms that allow users to create profiles, connect with friends, and share content. These sites enable individuals to communicate through messages, posts, and comments, fostering relationships and community engagement. Popular examples include Facebook, Twitter, and Instagram. Users can share various types of content, such as photos, videos, and articles, while also following others to stay updated on their activities. Social networking sites often include features like groups, events, and news feeds, making it easier for people to interact and discover new interests within their networks.