Union Square is a public plaza located in the heart of San Francisco, California. It is known for its vibrant atmosphere, featuring shops, restaurants, and art galleries. The square is a popular gathering place for both locals and tourists, often hosting events and performances. The area is surrounded by notable hotels and theaters, making it a central hub for visitors. Union Square is also famous for its large Christmas tree during the holiday season and the iconic Union Square Park, which offers green space for relaxation and socializing.