A Canadian Postal Code does much the same thing as any other code used for mail sorting, such as the zip code in the US. It speeds up mail sorting in the Post Office, and does so with a very high rate of accuracy.
Each of Canada's Postal Codes is unique enough to direct mail to your side of the street in your block. Many apartment buildings have their own Postal Code. Many large office buildings have more than one Postal Code. Occasionally, a single business will have its own Postal Code.
There is one person who has his own Postal Code:
Santa Claus
North Pole
H0H0H0