Difference between shell and command in ansible

Question

I am new to ansible world can anyone help me in understanding the difference between shell and command in ansible. When to use shell and when to use command. I know one use case

Answer 1

according to documentation :

shell – Execute shell commands on targets

It is almost exactly like the command module but runs the command through a shell (/bin/sh) on the remote node.

and:

command – Execute commands on targets

The command(s) will not be processed through the shell, so variables like $HOME and operations like "<", ">", "|", ";" and "&" will not work. Use the shell module if you need these features.

[edited to delete non-decent language]