What are the most secure chat apps?


There are many chat apps out there on the internet, like Discord, Slack, Microsoft Teams, and more. They are all pretty good in their own way, but what really is generally the best one?
Some of these chat applications are created for different reasons. Discord used to be meant for gamers to chat, but is now advertising as, "Whether you’re part of a school club, gaming group, worldwide art community, or just a handful of friends that want to spend time together, Discord makes it easy to talk every day and hang out more often.".
Slack and Microsoft Teams are more focused on business. 
By far, Telegram is the fastest and most secure chatting application for browser, Windows, Mac, Android, iOS, and more. Signal is also one of the most secure chat applications, potentially more secure than Telegram, but Telegram wins the fastest chat application. Signal is also super fast but Telegram is indeed slightly faster.
Telegram is also more simple, not even requiring a password, just a phone number! That simplifies things so much, you don't need to remember a password! The same goes for Signal too. All you need to do to log in is put in your username or phone number, and then type in the verification code it sent to you, and you're in! Signal does not have the ability to run on Desktop or in Browser, it is only a mobile app, but Telegram can run on almost any platform. 
Discord has more features than Telegram and Signal, but Telegram and Signal are both waaaaayyy safer.
When a message on Telegram or Signal is sent, it is using super-secure end-to-end encryption making it pretty much impossible for a hacker to see your messages, unlike Discord. 
Signal is a nonprofit company, and can never be acquired by another company, and, is not tied to any bad tech giants. 
While both of these platforms are great, Signal currently has more features. You can download Signal at signal.org, and you can download Telegram at Telegram.org.