Telnet is a client-server protocol, based on reliable connection-oriented transport. Telnet is the method that allows connection to a remote computer over the Internet and using programs and data as if they were on your local machine. User data is distributed in-band with Telnet control information in an 8-bit byte data connection over the TCP (Transmission Control Protocol (TCP) port number 23) where a Telnet server application (telnetd) is listening.
Run the below command from the Command Prompt (CMD) or PowerShell to install Telnet
dism /online /Enable-Feature /FeatureName:TelnetClient