Telegram, actually it was invented by germany company but we saw many rumours that it was developed by indian company said by our prime minister.There is nothing new in this telegram, it was copied version of whatsapp.They have the same features which are in W.A.But the difference is, we send large files upto 50mb while whatsapp can send only 25mb file at on time.
At one time many people installed and used this and later people came to know about this and uninstalled.But I saw in internet that this telegram was mostly used by terrosists because it is using high encryption technology thay no one hack our conversations.In my opinion whatsapp is best and trusted messenger while compare to Telegram.