Secret chats are needed for people who want really secure communication.
All traffic is encrypted from device to device. This means that only you and your interlocutor will be able to read your messages. No one will be able to intercept or decrypt them, including us, Telegram staff.
secret chat Messages cannot be forwarded. Still, you can specify the message the time after which they self-deleted after reading the source. Messages will be deleted from both your device and the other party's device.
Another difference between secret chats and regular ones is that they are not stored on our servers. All undelivered messages can only be read on your device.