Microsoft Office has many different versions that you can use in order to access the suite. These can be separated as Office 365, Office 2019 and Office Online with each version having their own unique quirks that differentiates them from each other.
Office 365 is a subscription service that can be accessed through either a monthly or yearly fee. This version gets updates and features as soon as they come out alongside security features and bug fixes however users have to keep paying in order to access exclusive features that aren't in the other versions. This is the version offered by CSN that we get from college payments.
Office 2019 is a one time payment access to the Office Suite. It comes with bug fixes and security features and that's it. It grants permanent access to the software but it may lack features that appear in Office 365. Office 2019 is also limited by a one computer per license forcing you to uninstall Office from your device or buy a new copy if you want to use it on another computer.
Office Online is a dumbed down version of the Office 365 product that can be accessed from your web browser. It lacks some features that you'd find in that version but allows for easier collaboration between people.
It is important to choose which version is right for you depending on your situation.
