Microsoft Word Add-In

Context:
- It can (typically) be accessed through the "Add-ins" tab within Microsoft Word.
- It can (typically) be located in https://appsource.microsoft.com/en-us/marketplace/apps?product=office%3Bword
- It can (often) be used to automate repetitive tasks, integrate with other services, or add new features.
- It can (often) be the result of an MS Word Add-In Creation Task.
- It can range from being a Microsoft MS Word Add-In to being a 3rd Party MS Word Add-In.
- It can range from being a Free MS Word Add-In to being a Paid MS Word Add-In.
- It can range from being a Free MS Word COM Add-In to being a Paid MS Word Web Add-In.
- It can be written in various programming languages including VBA (Visual Basic for Applications).
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Example(s):
- a Grammar Checking MS Word Add-In, such as Grammarly Add-in MS Word.
- an Electronic Signature MS Word Add-In, such as DocuSign Add-in MS Word.
- a Wikipedia Add-in MS Word, such as [[]].
- a Translation Add-in MS Word, such as [[]].
- a Legal-Domain Add-in MS Word (for legal document processing), such as: authorDOCS (by Onit).
- a Contract Review MS Word Add-In, such as a Bloomberg Law's Contract Solutions.
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Counter-Example(s):
- A Web Browser Extension, as it adds functionality to the web browser and not MS Word.
- An Excel Add-in.
- A VSTO Add-In.
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See: Microsoft Office, VBA, Software Component, Third-party Developer.

References

https://learn.microsoft.com/en-us/office/dev/add-ins/word/word-add-ins-programming-overview
- QUOTE: ... You can use the Office Add-ins platform, which includes the Word JavaScript API and the Office JavaScript API, to extend Word clients running on a Windows desktop, on a Mac, or in the cloud.
  Word add-ins are one of the many development options that you have on the Office Add-ins platform. You can use add-in commands to extend the Word UI and launch task panes that run JavaScript that interacts with the content in a Word document. Any code that you can run in a browser can run in a Word add-in. Add-ins that interact with content in a Word document create requests to act on Word objects and synchronize object state. ...