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what3words
Bah humbug. If you have a street address in the UK then the emergency services have a database and map. May be different in other parts of the world. If you are in the back of beyond use a grid reference rather than some proprietary closed system (also not good at multilingual, poor choice of words sometimes).
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what3words
Has extremely questionable licensing terms, and apparently an excellent marketing team.
With embedded LED tape so it glows at night and the emergency services can find you.
The later bit is kind of serious. Make sure your home is easy to identify should you need an ambulance in a hurry. Many door numbers are very hard to read from the street at night.