What term describes a collection of instructions executed to perform specific tasks?

The term that describes a collection of instructions executed to perform specific tasks is "Program." A program is a set of coded instructions that a computer can understand and execute to accomplish various functions, ranging from simple calculations to complex simulations or applications. Within a program, the instructions can direct the computer to manipulate data, control hardware, process information, and produce output based on the tasks defined by the user or developer.

The other terms, while related, are more specialized and do not encompass the entire concept of a collection of instructions. An applet refers specifically to a small application that runs within a larger application, typically in the context of web browsers. A script is a type of program but is generally shorter and often used for automating routine tasks or processes, usually executed within a specific environment. A plugin is an add-on to a program that enhances its capabilities but is not a standalone collection of instructions by itself. Thus, "Program" is the most comprehensive term that accurately describes a collection of instructions meant to perform specific tasks.