In the background
wdavdaemonMicrosoft Defender
○ Leave it
Antivirus from Microsoft, often installed by work.
What it is
Scans files for malware in real time.
Why it might be busy
During a scan or after an update. Usually a few minutes.
If you close it
Protection stops until it restarts. Leave it, or ask your IT team.
The verdict
○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.
In Activity Monitor
wdavdaemonwdavdaemon_enterprisewdavdaemon_unprivileged
From Procession’s guide, in the words the app shows.