A normal data web service (Content Service) delivers data when it is asked for it (for example by calling GetNextContentLevel). In contrast the '''Push Service''' is responsible for '''pushing''' data to every client.
The Push Service acts as a central data hub and has a set of methods to get the update information, containing the data that must be pushed to the client defined by its [[#Push Criteria|criteria]], by the sequence and by the last known status.
The Push Service is aware of known devices and users and delivers the situation relevant update information. The service is capable of persisting the update data in the {{UBIK}} system as the Push Service must deliver the correct data for every client.