Microsoft Office is the Default Office software these days, it always has been. If you work or interact with others in a business environment, you probably use Microsoft Office. It is not tremendously expensive these days, but it does have a subscription model. If you need to use some type of Office suite with the usual compliment of applications, but you do not wish to use or afford Microsoft Office, then check out this list of Microsoft Office replacement alternatives. I have used a couple of them over the years, they worked just fine.