Part of macOS
textunderstandingdText understanding
○ Leave it
Recognises dates, addresses and more in text.
What it is
Finds useful details in text, such as dates you can add to Calendar.
If you stop it
macOS starts it again straight away. Leave it.
The verdict
○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.
In Activity Monitor
textunderstandingd
From Procession’s guide, in the words the app shows.