It's the area covered by a square whose sides are each 1 foot long.
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Sqaure feet measure area, Feet mesure length
Square feet measure area and linear feet measure length. If a board is one (linear) foot long, that does not tell you how much area it covers, unless you also know the width.
A square meter is a measure of area. One square meter equals approximately 10.764 square feet.
Square feet means a flat area. Feet means a line measure. One square foot is an area equal to a square that measures one foot on each side. A rectangle measuring 6 inches by 2 feet would also contain an area of 1 square foot.
That's going to depend on how deep or shallow you spread it. If you spread it one foot deep, it covers an area of 2 square feet. If you spread it one inch deep, it covers an area of 24 square feet.