Halloween started out as "All Hallows Eve" which means the eve of All Saints Day, followed by All Souls Day (a two-day holiday to honor saints and all who have passed away - It was a catholic holiday). Somewhere in history, people started wearing scary masks while visiting the graves of their loved ones on that night because they thought it scared away evil spirits.... Then later on it became more about wearing scary masks, costumes and celebrating, and less about honoring the dead.