When I posted my profile, I notices a personal information box. What happens. . .?

When I posted my profile, I notices a personal information box. What happens to this information to this information if I choose to fill it out?
 
The Personal Information section is optional for jobseekers. If you are actively seeking employment and wish to share your personal information with employers and recruiters, you can fill this section out and post it as part of your profile. However if privacy is important, you can leave this section blank.

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