Geolocation

5 yr old to me: So, is Keon (best friend) home from her trip?

Me to 5 yr old: No, she is still in Toronto. She won't be back till after Christmas.

5 yr old to me: So, she won't be at home for Christmas? How will Santa know where to bring her presents?

Me to 5 yr old: Geolocation.

5 yr old to me: Oh, so Keon added Santa to her People Service - so that he could be granted access to her various identity services like geolocation in a controlled & privacy-respecting manner?
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Me to 5 yd old: Don't tell your brothers but you are my favourite.