St Stephen's Day, known as Sant Esteve in Catalonia, is celebrated on December 26th, primarily in the Catalan region of Spain. It is a public holiday there, following Christmas Day.
St Stephen was the first Christian martyr, stoned to death shortly after the Crucifixion of Jesus, which is why he is celebrated the day after Christmas. His feast day has been recognized by various Christian denominations for centuries.
People spend time with family and friends, enjoying the extended holiday. It is a time of relaxation and recuperation after the excitement of Christmas Day. Many people use this day to enjoy outdoor activities or visit relatives if they didn't do so on Christmas Day.