Holiday Calendar is a free app that allows you to keep track of all the important holidays and festivals of the year. This application provides a comprehensive list of holidays and festivals for the year 2023. The app allows you to select your country of origin and view the holidays and festivals from various countries like the USA, India, Malaysia, UK, Canada, Russia, Philippines, China, South Africa, UAE, Singapore, and many other countries.

The app is based on the concept of a calendar, which is a list of the most important events of the year. Each day of the calendar is a day of the week, and each week contains seven days. Each day has a number of events that take place in the world. These events can be religious, political, or social in nature.