What's the difference? Because the latter is your own device and the former still let's you connect to it. I'm kinda sleepy, so I'm sure it's a stupid question

What's the difference? Because the latter is your own device and the former still let's you connect to it. I'm kinda sleepy, so I'm sure it's a stupid question. Edit: 127.0.0.1 is only getting in and nobody else.