If you're a Moodle admin, this page will tell you about the major changes affecting you in Moodle 4.3. If you'd like to see full details of the release with technical information, here are the Moodle 4.3 release notes.
Security enhancements
MFA
Multi-factor authentication brings added security to your site.
YouTube and Vimeo
'Do not track' privacy options are available for YouTube and Vimeo.
Report builder
Another new report source
Course categories is now available as a new report source.
New filter
Custom reports may be filtered on context level.