echo command means Echo the STRING(s) to standard output.

Syntax
echo [SHORT-OPTION]… [STRING]…
echo LONG-OPTION
In man page the describe it
- echo – display a line of text.
- man echo– More details information about echo command.
echo command in Linux with Examples
$ echo "Welcome to DevopsRoles.com !"
Conclusion
echo command is the simple the command in Linux. It is the most popular in use terminal Linux display a line of text.