Telegram is a popular messaging application with over 500 million active users. It provides various features like file sharing, VoIP calls, and end-to-end encryption. Telegram's business model focuses on user convenience rather than profit generation. It does not charge users or show ads. While Telegram raised funds through an ICO in 2018, it has not generated revenue as of 2020. The founders prioritize free messaging and aim to explore optional paid features if urgent funds are needed in the future.