Adding holidays to Google Calendar is a convenient way to keep track of national, religious, or cultural observances directly within your schedule. Google Calendar allows users to subscribe to public holiday calendars based on their country or region, which automatically displays official holidays on the appropriate dates. This helps you plan events, meetings, or travel around days off without manually inputting each one. You can manage these calendars in your settings, where you can add or remove holiday lists as needed. Keeping holidays visible in your calendar ensures better planning and avoids conflicts with important dates throughout the year.