What are the instructions in a script?

Instructions in a script, often referred to as stage directions or action lines, provide guidance on how actors should perform, how scenes should be set, and what emotions or tones should be conveyed. They can include details about character movements, facial expressions, and interactions, as well as descriptions of the environment and any relevant sound or lighting cues. These instructions help to create a cohesive vision for the production and ensure that all elements work together effectively.