Add-in is an extension of an application that adds or improves existing features. Add-ins are often used to customize programs or provide powerful new features. With the help of add-ins, users can extend the capabilities of programs and add specific-purpose features.
Add-ins can be divided into two categories: code-based add-ins and third-party add-ins. Code-based add-ins are written in programming languages such as Visual Basic for Applications, C#, C++, and .NET. They can add a variety of new features such as customized menu items, additional toolbars, and custom forms. Usually, the code-based add-ins are distributed as COM (Component Object Model) components.
Third-party add-ins are applications created by independent or commercial software vendors. These applications are used to extend the functionality of existing programs. They can include everything from spell-check tools to data management applications.
Add-ins typically require installation before they can be used. Once installed, they can be accessed either from the programs themselves or from an external menu within the program. In some cases, the add-ins may need to be registered with the program in order to be used.
Add-ins provide users with the flexibility to customize their programs and add specific features. By using the right add-in, users can easily extend the capabilities of existing programs and gain access to powerful new features.
