LEGO is a type of building toy created and made by The Lego Group, a company from Denmark. LEGO bricks are colorful plastic building blocks that can be joined together easily to make a tower, house, and more. LEGO bricks are joined together by studs on the top, and holes in the bottom of the brick commonly known as the brick-and-knob connection. LEGO is the most popular building toy in the world.