What does the presence of the cydia app on an ios device indicate?

Had to look for the options and here is my answer. 
Cydia app is an app that is common found on those devices that are jailbroken because this provides third-party custom apps. Therefore, the presence of Cydia app on an iOS device would indicate that the device has been jailbroken. Hope this helps.

Ican of you tell me who sally is