An indoor stadium is a large, enclosed venue designed for various sports and entertainment events. These facilities typically feature a roof to protect spectators and participants from weather conditions. Indoor stadiums can host activities such as basketball, volleyball, and concerts, providing a versatile space for different types of gatherings. Many indoor stadiums are equipped with seating arrangements, lighting, and sound systems to enhance the experience for attendees. They often have amenities like concession stands and restrooms, ensuring comfort during events. Notable examples include the United Center in Chicago and the O2 Arena in London, which attract large crowds year-round.