Google Cloud App refers to applications that are built and deployed on the Google Cloud Platform (GCP). Google Cloud Platform is a suite of cloud computing services offered by Google that provides infrastructure, platform, and software as a service (IaaS, PaaS, and SaaS) solutions.

Google Cloud App can refer to various types of applications, including:

1. Web Applications: These are applications that are accessed through web browsers. They can be built using popular web technologies such as HTML, CSS, JavaScript, and frameworks like Angular, React, or Vue.js. Google Cloud Platform provides various services and tools to host, deploy, and manage web applications.

2. Mobile Applications: Google Cloud Platform offers tools and services for building and deploying mobile applications for both Android and iOS platforms. These applications can leverage services like Firebase for backend functionality, authentication, push notifications, and more.

3. Data Processing Applications: Google Cloud Platform provides powerful data processing and analytics tools, such as BigQuery, Dataflow, and Dataproc. These tools allow developers to build applications that can process, analyze, and derive insights from large volumes of data.

4. Machine Learning Applications: Google Cloud Platform offers a range of machine learning services, such as AutoML, TensorFlow, and AI Platform, which enable developers to build and deploy machine learning models and applications. These applications can be used for tasks like image recognition, natural language processing, and predictive analytics.

5. IoT (Internet of Things) Applications: Google Cloud Platform provides services for building and managing IoT applications. These applications can involve collecting and analyzing data from connected devices, managing device communication, and integrating with other cloud services for data storage and processing.

In summary, Google Cloud App refers to applications that are built and deployed on the Google Cloud Platform, utilizing its services and tools to provide scalable, reliable, and flexible cloud-based solutions.