What is a Unibody Truck?

Pickup trucks are a classic vehicle type that has been around for decades. However, within the last few years, a renaissance has occurred in their design. While originally debuting in the 60s and popping up again in the mid-2000s, unibody trucks are more popular than ever, with the king among them being the Honda Ridgeline (that unibody truck we just mentioned popping up in the mid-2000s? That was the Ridgeline).
Today, they’re comfortable, capable, and reliable machines that have impressive fuel efficiency and towing capacities. So, what is a unibody truck?