Nowadays, Telnet is an utility for manually debugging connectivity issues.
Historically it was a network protocol developed in 1969.
You can use it to manually connect and talk to network services to establish they are functioning e.g SMTP, FTP, SQL Server
Use : TELNET [hostname/ip] [port]
Examples :
TELNET ftpserver 21
TELNET smtpserver 25
TELNET sqlserver 1433
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