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A "plug-in" is a piece of software that adds a new function to an existing program, or it can be a hardware component that connects to a computer to expand its capabilities. For example, browser plug-ins add features like PDF viewing to a web browser, while a hardware plug-in might be an expansion card that gives a computer more ports.

Software plug-in

What it is: A component that extends the functionality of a larger program without modifying its core code.

How it works: It uses a standardized interface to communicate with the host application.

Purpose: To add features, improve performance, or enhance security.

Hardware plug-in

What it is: A physical add-on, often a circuit board, that is inserted into an expansion slot on a computer's motherboard.

How it works: It connects to the main circuit board to add new capabilities.

Purpose: To provide new or additional functionality that the original hardware didn't have.