How to install Telegram
Telegram is a text and voice communication app with good privacy protection. You should be able to install it in your phone or computer in a minute or two.
Can I use Telegram web (web.telegram.org) to join online programs and groups without installing the app?
Yes, you could in most cases or for a temporary use. The web version has limitations, e.g. no voice call feature. Installing and using Telegram app is recommended for reliability and an overall better experience for you.