Which innovative POS feature was first widely adopted by restaurants in the early 2010s, fundamentally changing front-of-house operations?

The point-of-sale (POS) technology in restaurants has undergone remarkable transformation over the decades, revolutionizing how establishments manage orders, inventory, and customer data. Modern restaurant POS systems now integrate tableside ordering, kitchen display systems, inventory management, customer relationship tools, and even predictive analytics. How well do you know the history and capabilities of these essential restaurant management tools that have changed the culinary business landscape forever?

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Tableside mobile ordering devices that allowed servers to send orders directly to the kitchen without returning to a central terminal
Biometric fingerprint authentication for employee clock-in and register access
AI-powered inventory prediction systems that automatically place orders with suppliers
Blockchain-based payment processing for cryptocurrency transactions