Google Cloud Storage is a service for storing unstructured data in Googles cloud. It allows users to store objects, which are immutable pieces of data consisting of files of any format, in containers called buckets. All buckets are associated with a project, and you can group your projects under an organization. Each project, bucket, and object in Google Cloud is a resource in Google Cloud, as are things such as Compute Engine instances.

Google Cloud Storage offers four storage classes, which differ in their pricing, minimum storage durations, and availability. These classes are Multi-Regional Storage, Regional Storage, Nearline Storage, and Coldline Storage.

Some basic ways to interact with Cloud Storage include using the Google Cloud console, which provides a visual interface for managing data in a browser, and the gcloud CLI, which allows users to interact with Cloud Storage through a terminal using gcloud storage commands.

Overall, Google Cloud Storage is a managed service for storing unstructured data that combines the performance and scalability of Googles cloud with advanced security and sharing capabilities.