A script can refer to several things depending on the context:

• In Computing: A script is a program or sequence of instructions that is interpreted or carried out by another program rather than being compiled. Scripts are often used to automate tasks, control software applications, or create dynamic web content.
• In Film, Television, and Theater: A script is a written work that outlines the dialogue, actions, and settings of a play, film, television show, or other performance. It serves as a blueprint for the production.

For more details, you can refer to the following resources:

• TechTarget definition of script
• StudioBinder definition of a screenplay