Telegram these days is used very frequently by every one for those who share knowledge through groups or to chat with friends.
First the logo of the app is very unique and it attracts the user to install the app see what the app is providing.
Now you can chat with friends by sending stickers and with unique wallpapers you can change your chat display and make it beautiful.
Now in other groups it very difficult to add more than 300 people on one group but in telegram you can add as many people as we can so we can make our group bigger and share our knowldge to larger people.
Now the files usually more than 20mb is difficult to share with other ones but here you can upload bigger files and group members can download it with ease.
So very good app to use for daily purpose.