Bash alias command not found

1. What is alias command in bash?
2. Why is bash command not found?

What is alias command in bash?

A BASH Alias is a map of commands with the sets of commands or functions that can be used as a shortcut in the command line for a BASH environment. Bash Alias allows to aggregate multiple functions into a single command and also it avoids repetitive or large commands into a simple shortcut command.

Why is bash command not found?

Sometimes when you try to use a command and Bash displays the "Command not found" error, it might be because the program is not installed on your system. Correct this by installing a software package containing the command.