Google Keep is a web-based note-taking tool that allows users to create, edit, and share notes from a unified platform. It offers collaboration tools, notes management, reminders, annotations, task tagging, meeting notes, and handwriting recognition. Users can add lists, photos, audio, and notes, which can be organized using colors and labels. The tool enables users to record voice memos, which can be automatically transcribed into the application. It also allows teams to set location-based and time-based reminders.