WhatsApp is the most downloaded messaging app with more than 5 billion downloads. On the other hand, the Telegram is having around 350 million downloads. This shows a big difference between the WhatsApp and Telegram.
( These stated nos. are of the time when I am writing this answer. They may change in the future depending on the popularity. )
WhatsApp, the world's most popular messaging app is facing a great challenge from one of it's rival named Telegram. There are some of the features which are not provided by the WhatsApp and is provided by Telegram, which are shifting the people to use Telegram rather than WhatsApp.
1) Massive capacity / More engagement
WhatsApp can have maximum of 256 people in a group. This is one of the disadvantage of WhatsApp. On the other hand, Telegram can have around 200 people but, it itself converts the group into super group, when no. of people increases for the same group. A super group in Telegram has a capacity around 2,00,000 people.
2) Concept of username for privacy
Both WhatsApp and Telegram ensures the user's privacy. In the privacy criteria, Telegram gives you more features than WhatsApp. Telegram provides you to communicate with the person, you are not having the phone number. This is done with the help of username feature. Just you have to search the appropriate username and then you can talk. This is done without sharing any phone no.
3) cloud storage
Telegram provides you the facility of cloud storage. This is one of the biggest advantage over WhatsApp. In Telegram, there is no need of taking backup unlike WhatsApp. All your data will be save as all your data is getting stored on cloud. In WhatsApp you have to take backups whenever you log out it. This backups sometimes becomes very problematic conditions.
4) Facility of bots
Telegram provides you the facility of bots. These bots helps you to handle your different chatting tasks in a big, massive groups.
5) Secret chat facility
Telegram provides you the facility of secret chat. This secret chat option is having the self-destruction feature. This feature helps in self deleting the messages by it's own. This feature is also end to end encrypted. So, there is no possibility to hack the chat, messages or the files in this feature.
These are some of the features which are making a significant shift from WhatsApp to Telegram may also change the worlds most popular messaging app i.e. from WhatsApp to Telegram.
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