Why is SFTP called a secure protocol ?

SFTP (Secure File Transfer Protocol) is called a secure protocol for file transfer as it takes the following measures to ensure data safety :

1. SFTP requires that the client user must be authenticated by the server and the data transfer must take place over a secure channel (SSH).
2. All data is encrypted before being sent across the network.
3. SFTP encrypts both commands and data providing effective protection against common network security risks.