Google Cloud Professional Data Engineer Exam 2025 – 400 Free Practice Questions to Pass the Exam

The feature of Google Cloud Pub/Sub that enables decoupled communication between applications is message queuing. This functionality allows different applications or components within a system to interact without needing direct connections or knowledge of each other's internal workings.

In a messaging system, publishers send messages to a topic, and subscribers can independently consume these messages from the topic without the publisher needing to know who the subscribers are or when they are processing the messages. This decoupling means that applications can be developed, deployed, and scaled independently, which is key for building resilient and flexible architectures.

The other options do not provide the same level of communication independence. Data modeling focuses on structuring the data, data storage relates to how and where data is held, and data replication focuses on creating copies of data for availability or disaster recovery. While all of these aspects are important in data management and engineering, they do not directly facilitate the decoupling of application communication in the way that message queuing does.