An Add-in for Microsoft Office is a special software program written with the purpose of extending the capabilities of its core software. These are generally used to help in auto*mating or simplifying your work.
Microsoft Office is one ofthe most popular office man*agement software out there despite this, office still has cer*tain limitations which make it a perfect candidate for add-ins.
Much of the add-ins are pro*vided by Microsoft itself, but there are also other third-party add-ins available online. Some of them are free while you'll have to pay for the rest