Yes, you enter an email and you get a list of the hacks it's been found in, along with the type of data that's in the data breach.

At that point you just go grab the data breach from some other location and pull the data. Including passwords, which will often be reused across other services and give you access to other accounts. The breach data (or subsequent accounts accessed from the passwords) may have a lot of additional data, like location, personal preferences, message contents, etc..

It's _much_ more impactful than simply Googling someone's email address.