Windows Defender adds lots of features in the Fall Creators Update.
Windows Defender is Microsoft's security services, the ATP running on the cloud (as a service charge for accounts) that contains several sub Windows Defender service originally split from the ATP Windows 10 clearly. But Microsoft will start appending to it's arriving in the Fall Update Creators. All the features that Windows Defender will have the prefix as a brand, Microsoft security, Windows Defender does not mean an antivirus alone.