Cinemas are venues that screen films for public audiences, usually in purpose-built auditoriums with large screens and surround-sound systems. Their programmes commonly include new releases, family films, independent productions, documentaries and occasional classic or event screenings. Showtimes may vary by day, and some venues offer subtitled, audio-described or relaxed screenings to suit different audiences. Customers can typically buy tickets for individual screenings, with options to book seats in advance where allocated seating is available. Many cinemas also sell refreshments such as popcorn, sweets and drinks, and may provide accessible seating, hearing assistance or facilities for children. Larger venues can offer different viewing formats, including 3D, premium large screens or enhanced sound, while some arrange private screenings, educational visits or live broadcasts of theatre, music and sporting events.