Starbucks is a global coffee chain that is open on Christmas because they want to provide a place for people to gather and enjoy their coffee during the holiday season. Many people are out and about on Christmas, whether they're traveling or visiting friends and family, and Starbucks wants to be a welcoming place for them to take a break and enjoy a cup of coffee or tea. It's also a way for Starbucks to show that they care about their customers and want to provide a convenient and enjoyable experience no matter what time of year it is.