Audiovisual means possessing both a sound and a visual component, such as slide-tape presentations,films, television programs, church services and live theater productions.
Audiovisual service providers frequently offer web streaming, video conferencing and live broadcast services.
Lighting or illumination is the deliberate use of light to achieve a practical or aesthetic effect. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight. Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings.