St. Patrick's Day is celebrated on March 17th each year, honoring St. Patrick, the patron saint of Ireland. This day marks the anniversary of his death in the 5th century and is a cultural and religious holiday. People often wear green clothing and accessories, symbolizing the lush landscapes of Ireland and the green hills associated with the holiday. Festivities include parades, music, and traditional Irish food and drink. Many cities around the world hold celebrations, showcasing Irish culture and heritage. The day is also associated with various symbols, such as the shamrock, which St. Patrick used to explain the concept of the Holy Trinity.