So, you know how when you want to find out something, like where the nearest pizza place is, you ask your mom or your dad to look it up on their phone? Well, Google is like a really smart grown-up version of that.
Goog-411 is a special part of Google that helps you find phone numbers for businesses you want to call. Instead of having to look through a big phone book or try to remember a phone number you saw somewhere, you can call Goog-411 by saying "OK Google," and then asking for the name of the business you want to call.
When you call Goog-411, a very nice lady or man voice will talk to you and ask you what city and state you're in. Once you tell them that, you can ask for the name of the business you want to call. The voice will search through Google's big list of phone numbers and give you the number you need.
It's like having your own little helper right in your phone that can find phone numbers for you when you need them. And the best part is, you don't even need to know how to read or type - you can just talk and the nice voice will help you out!