Which Google tool allows for easy sharing and collaboration on documents?

Google Docs is the correct answer because it is specifically designed for creating, editing, and collaborating on documents in real-time. With Google Docs, multiple users can work on the same document simultaneously, making it easy for teams to communicate and contribute. The built-in commenting and suggesting features facilitate feedback and allow for discussions directly within the document itself.

While Google Drive is a cloud storage service that enables the storage and sharing of files, it is not a document editing tool on its own. It houses documents created in Google Docs, but collaboration occurs mainly within Docs. Gmail is primarily an email service and is not suited for document creation or collaboration. Google Keep is a note-taking service that allows for sharing notes but isn't focused on the robust document collaboration features that Docs provides. Consequently, Google Docs stands out as the ideal tool for easy sharing and collective editing of documents.