Personal info can be useful to share with staff colleagues
Tameday has a section on your profile specifically for Notes for personal information that you can share with colleagues.
Should they need to get in touch outside of work hours they can access information that you choose to share with them: telephone numbers, personal email addresses, home address etc. Staff Notes are useful for HR to store all personal data in one place, useful if a colleague has any medical conditions/allergies that could be important info in the future.
If you decide not to share your personal info only Administrators will have access to this information.