Google Calendar is a time-management and scheduling calendar service developed by Google. It allows users to create and edit events, reminders, and tasks, which can be viewed in various calendar views, such as daily, weekly, and monthly overview. Events can have locations, descriptions, invitees, and can be set as recurring. Google Calendar also allows for the creation of multiple calendars and sharing them with other users, making it a great tool for team collaboration. It is accessible on the web and via mobile apps.