Direct inward dialing is like having your own telephone number that people can use to reach you directly without having to go through a bunch of other people or a main phone number.
For example, if your mommy or daddy wants to call you on your birthday, they can use your direct inward dialing number to call you directly instead of calling the school office or someone else first.
It's like having your own secret code that only the people you want to call you know. This way, you can talk to them right away without any delays or extra steps.
And just like how you might have a different code or password for your phone or tablet at home, direct inward dialing works the same way, except it's for your phone number. It's a special way to help you get connected with the people who matter to you most.