What does an engine immobilizer do & how much do they cost?

Most modern cars come with an engine immobilizer. Here is what that means and how much they cost if your car isn't equipped ...
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Episode 2: Solar concentrators, massive mines and a convent! Touring Spain and Portugal by BMW GS

Episode 2 of 11. Get 5% off your abr Festival tickets with "TMF5" at checkout! I buy my riding kit from Sportsbike shop. I recommend Sizzapp motorcycle trackers, use "TMFTRACK" for 10% off! Get a £50 ...