What does it mean when you're "verified" on twitter?

[Name Unknown]

Okay, so I know what it means when a twitter account is verified. It is my sister who doesn't seem to comprehend. I've explained it to her several times with many different examples. I would like to add that she is older than I-but she still doesn't seem to understand. So I was hoping someone would help me come up with a good enough explanation. This has been bugging me so much, it is not that difficult to understand!

[Daniel]

It means you have been "approved" and can now access the full features of Twitter. Sorry, but it can't be any more simplified than this. If she doesn't understand, she needs to get her head out of the gutter.