Pocket calendars are highly useful types of calendars for their portability and convenience. These small calendars are designed to fit easily into pockets, purses, or bags so that you always have your schedule and important dates with you. They serve as quick references, allowing you to check dates, days, and months at a glance, even when you're on the move. With a pocket calendar, you can jot down appointments, meetings, deadlines, or social events as soon as they come up, keeping you organized and ensuring you never miss a meaningful engagement.