There is nothing wrong with having a paper calendar or a physical planner to keep track of things, however, everyone generally has their phone with them and a digital calendar that syncs with your phone has many more features and capabilities than a physical calendar. You can easily create repeating events, and can sort events into color coded categories so that they are easier to see. You can add URLs, location addresses, or contact information for a person you may be meeting with. You can also add events from a website or facebook with just a couple clicks. With a digital calendar on your phone you can quickly and easily keep track of everything going on throughout your day, no matter where you are. Each of the common operating systems have a built in free calendar that will suit the needs of most people. Most of the note taking apps and to do list apps also have built in calendars. In addition to these, there are also many other calendar options with specific features for specific purposes. Some excel at scheduling groups, for example a shared business or family calendar, and others provide unique interfaces with a variety of views and widgets.Â