FTP (File Transfer Protocol) is a network protocol used for transferring files between a client and a server over a TCP-based connection. It is commonly used in hosting environments to upload, download, and manage website files on a remote server.
FTP is designed specifically for file transfer operations such as moving, copying, renaming, or deleting files on a server.
Table of Contents
How FTP works
FTP operates using a client–server model:
- the client connects to an FTP server
- the user authenticates with a username and password (in most cases)
- files are transferred between client and server
A typical FTP session allows operations such as uploading and downloading files, as well as managing directories.
Connection structure
FTP uses two separate communication channels:
- Control channel – used for sending commands and receiving responses
- Data channel – used for transferring the actual file content
This separation allows commands and file transfers to be handled independently.
Ports used by FTP
By default, FTP uses:
- Port 21 for control communication
- Port 20 for data transfer (in active mode)
In passive mode, data transfer uses dynamically assigned ports instead of port 20, which improves compatibility with firewalls and modern networks.
Authentication
FTP access is typically protected using:
- username
- password
Some servers may also allow anonymous access, but in hosting environments this is usually disabled for security reasons.
Types of FTP connections
FTP can operate in different modes:
- Active mode – the server initiates the data connection back to the client
- Passive mode – the client initiates both control and data connections (more commonly used today)
Security considerations
By default, FTP does not encrypt transmitted data. This means that usernames, passwords, and file contents can be transmitted in plain text.
For secure file transfer, modern alternatives are used:
- SFTP (FTP over SSH)
- FTPS (FTP with SSL/TLS encryption)
Practical use cases
FTP is commonly used for:
- uploading website files to a hosting server
- managing files in a remote environment
- transferring large batches of files between systems
- maintaining legacy systems that still rely on FTP access
Practical implications
Because FTP is not encrypted by default, it should only be used in trusted environments or replaced with secure alternatives when possible.
In modern hosting systems such as mybox, secure transfer methods like SFTP are preferred for accessing server files.
Summary
FTP is a standard protocol for transferring files between a client and a server. It uses separate control and data channels and enables remote file management, but it does not provide encryption by default, making secure alternatives like SFTP more suitable for modern use.