Telegram stores your phone number (as a unique identifier

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Search: To enable you to search through your messages across all devices.
Notifications: To notify you of new messages on all your devices.
Metadata:
Your basic account data which may include your profile name, profile pictures, and "about" information. You can choose to keep your username public.
Your contacts are stored (with your permission) to notify you when your contacts join Telegram and to display names in notifications. Only the number and name are stored.
Telegram may log your IP address, device type, and similar metadata.
If you enable 2-step verification or use kuwait telegram phone number list Passport, you can optionally set up a password recovery email, which is stored separately and only used for recovery.
2. Secret Chats:

Storage:
Secret chats use end-to-end encryption (E2EE). This means the data is encrypted with a key that only you and the recipient know.
Telegram does not store your secret chats on their servers.
No logs are kept for messages in secret chats. After a short period, Telegram no longer knows who or when you messaged via secret chats.
For the same reason, secret chats are not available in the cloud and can only be accessed from the device they were initiated on. They disappear if you log out or delete the Telegram app on that device.
Media sent in secret chats is encrypted with a separate key before upload, unknown to the server. This key and the file's location are then re-encrypted with the secret chat's key. Telegram periodically purges this "random indecipherable garbage" from their servers to save space.

Encryption:
End-to-end encryption ensures that not even Telegram can access the content of these messages. The decryption happens locally on the recipient's device using a key pair.
Purpose:
To provide a highly secure and private communication channel where only the participants can read the messages.
Secret chats also offer features like self-destructing messages and prevent forwarding.
Limitations:
Secret chats are device-specific.
They do not support cloud backups.
Group chats cannot be secret chats.
Web and Desktop apps have limited or no support for secret chats due to security considerations regarding local storage on those devices.
3. Other Data:

Public Chats (Channels & Groups): Data you post in public communities is encrypted in storage and transit, but it is accessible to everyone.