LINE is a popular messaging app launched in Japan in 2011 that allows users to chat, send voice messages, share photos and videos, make free calls, and play games. It has over 10,000 stickers and emoticons available. The app is widely used across Asia and allows users to communicate across distances through features like one-on-one chats, group chats, timelines to share status updates, and real-time video calling. The document discusses the key features and concludes that LINE has helped shorten distances between users in different countries by allowing near-instant messaging.