Plug-in software bridges differences between OSs, and provides more advanced and
specific functions than the OSs.
b) Plug-in software does not work as a standalone program, but can be integrated into
applications, such as a Web browser, to enhance their functions.
c) Plug-in software is often included in applications such as a spreadsheet, and allows
the users to record and replay the series of operations performed.
d) Plug-in software is provided to replace part of a program for the purpose of
modifying functions or fixing bugs.