Which winter holiday is celebrated on December 26th in many countries?

December 26th is celebrated as Boxing Day in many Commonwealth countries (UK, Canada, Australia, New Zealand, etc). It is a public holiday where tradition holds that servants, tradespeople and the poor receive “boxes” with gifts or money from their employers/customers. In some countries it’s also a sports-related holiday (e.g., in England cricket or horse racing). Hence: Boxing Day.