Addons

An add-on is a software component that extends or customizes the functionality of an existing application or system. Add-ons are designed to be optional and removable, enabling users to tailor software to their needs without changing the base code. They may add new features, integrate with external services, automate tasks, or alter the user interface.

Add-ons come in various forms, including plugins, extensions, modules, and themes. The naming often varies by ecosystem: plugins add new capabilities to an application; extensions modify or augment existing features; themes alter appearance. Some platforms separate content or data by add-ons, while others integrate them more tightly. Distribution typically occurs through official stores or repositories, with installation handled by the host application, often including automatic updates and dependency management. Compatibility is a key concern, as add-ons rely on stable APIs and may require matching versions of the host.

Security and governance are important for add-ons. Repositories may require signing, code reviews, and permission scopes. Users should consider source trust, permissions requested, and updates that address vulnerabilities. Poorly designed add-ons can introduce performance issues, conflicts, or security risks.

Common examples include browser extensions that add features to web browsers, WordPress plugins that extend a content management system, and game mods that alter gameplay. The concept of add-ons fosters customization and ecosystem growth but also requires maintenance and compatibility considerations as the host software evolves.