Add-in is a term used, especially by Microsoft, for
a software utility or other program that can be added to a primary program.
The Microsoft Style Guide says that Microsoft Bookshelf is an add-in for
Word and that Analysis Toolpak is an add-in for Microsoft Excel. According
to the Style Guide, add-in should not be confused with add-on, a term
for a hardware expansion unit. (However, some add-on manufacturers do
call them "add-ins.")
A similar term is plug-in, a term originated by Netscape for application
programs that can be activated within a Netscape Web browser window.
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