Telegram is a cloud-based mobile and desktop messaging app with a specific focus on security and speed. If you're concerned about your data privacy when messaging others, Telegram may be for you. There are two big advantages of using Telegram - it's open source and it's entirely cloud-based - so even if you don't have your phone, you can still access all of your data from your computer. Users can even set a timer for messages to self-destruct, erasing it from the receiving device as well. Telegram is available across all platforms.