FTP (File Transfer Protocol) is a TCP/IP protocol which is used to transfer files. In Telehack, it is used to transfer executable (EXE) files from host to host.

The following is a screenshot of the FTP command showing a list of commands:

ftp> ?

ascii   switch to ASCII mode             
bin     switch to binary mode            
close   close the connection             
del     delete files from remote host    
get     get files from remote host       
lls     list files on local host         
ls      list files on remote host        
open    connect to a remote host         
put     put files to remote host         
quit    exit                             
user    authenticate to the remote server