Calendly is an online scheduling tool that helps individuals and businesses streamline the process of setting up meetings and appointments. It integrates with various calendar systems like Google Calendar, Outlook, and iCloud, allowing users to efficiently manage their schedules by sharing a personalized link that recipients can use to book available time slots directly. Features typically include calendar synchronization, timezone detection, custom meeting types, automated notifications, and reminders, as well as options for team scheduling and analytics to track meeting activities.