Which term refers to the set of software that performs specific functions with defined input and output?

The term that denotes a set of software performing specific functions with defined inputs and outputs is referred to as a procedure. A procedure typically encapsulates a series of instructions or operations that are executed to accomplish a particular task or to process specific data. It serves as a structured way to execute a task while allowing for clear input parameters and output results.

In the context of software development, a procedure might include not just the logic needed to perform an operation but also details on how data is received and returned. This level of abstraction allows for modular design where procedures can be reused across different parts of a system, contributing to efficiency and clearer organization of code.

Considering the other terms, a module often refers to a larger grouping of related procedures or components designed to encapsulate functionality, which makes it a broader concept than a procedure. A script is typically a sequence of commands that automates processes, often used in scripting languages; it may include multiple procedures but isn't solely defined by input and output like a procedure is. A function, while similar in purpose to a procedure, is often used specifically in programming languages to denote a block of code that can return a value, but it lacks the broader connotation of a structured process that procedures encapsulate.