Shopping carts have wheels so they are easy to push around the shop.
The wheels can turn in different directions. That helps you steer the cart around every corner.
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Wheels roll round and round so things move without dragging.
Skateboards have four little wheels underneath a wooden board.
A wheelbarrow has just one wheel to help carry heavy loads.
Roller skates let you glide along on wheels on your feet.
People invented the wheel thousands of years ago, long before cars.