And you need to buy for Windows, macOS different platforms, the price is relatively high.
It can be used indefinitely after purchase, but once a new version is available, it will cost money to upgrade. The Office 2019 is a software product that is traditionally “buy-out”. And the pricing of Office 365 is not expensive, so the service is very cost effective. Even if Microsoft has an Office 2021 tomorrow, as long as it has not expired, you can Use them for free.
Users who subscribe to Office 365 can use the “All Platforms (Win+Mac+Android+iOS), latest version” Office software during the service period. In plain language, it is a “year-old service.” In fact, “Office 365” is a “subscription service”. People often see the names Office 2019 and Office 365, which many people will confuse. How is Office 2019 different from Office 365?