Read visitor profile details in Sitecore

We can read visitor’s personal details in Sitecore.

if (Sitecore.Analytics.Tracker.Current.Contact != null)
  {
    var personalFacet =    Tracker.Current.Contact.GetFacet<IContactPersonalInfo>("Personal");
    if (personalFacet != null)
    {
        if (personalFacet.FirstName != null)
        firstName = personalFacet.FirstName;
    }
  }