For an explanation of this process and more valuable information about civil registration, see the page on the Archive of Ontario site about Ontario Vital Statistics (linked in the Related Resources section below). Many civil registration records can also be searched online (e.g. using Ancestry Library Edition, FamilySearch or other databases). To learn more about these, check out the pages on Birth, Marriage and Death, linked below in the See Also section.
An overview of the kinds of records valuable for family history research that are held at the Archives of Ontario.