An apple box is a wooden box commonly used in film and television production. Despite its name, it's not related to actual apples. The term "apple box" comes from its use in the early days of film production when they were originally used to store apples on movie sets (since they were commonly found on film sets back then). Over time, the boxes became so widely used for various purposes, such as for props, creating risers, or leveling out equipment, that the name stuck.
Apple boxes come in different sizes (full, half, quarter, etc.) and are incredibly versatile tools on set for adjusting the height of equipment, providing a stable surface, or even giving actors a boost for specific shots. They became iconic in the industry due to their usefulness and durability.