
Explanation
Graphical user interface, text, application Description automatically generated

Box 1: Office Add-ins
Scenario: SalesApp must be integrated with Microsoft Word and must combine images and text from multiple sources to create a quotation as a DOCX file.
You can use the Office Add-ins platform to build solutions that extend Office applications and interact with content in Office documents.
Box 2: Microsoft Visual Studio
Visual Studio can be used to create Office Add-ins for Excel, Outlook, Word, and PowerPoint. An Office Add-in project gets created as part of a Visual Studio solution and uses HTML, CSS, and JavaScript.
Box 3: Fluent UI
Fluent UI is the upcoming and continually evolving design system for Microsoft 365. Currently, there is an ongoing merge in the process to have one consistent UI Framework across the Microsoft ecosystem.
Reference:
https://docs.microsoft.com/en-us/office/dev/add-ins/overview/office-add-ins
https://n8d.at/5-reasons-or-thoughts-on-fluent-ui-web