Square Feet is a plural form of square foot. It is an area measurement unit abbreviated as ft2, sq ft, sf. Suppose 1 ft width multiplied by 1 ft height is called 1 square foot. On the other hand, 10 ft * 10 ft is equal to 100 ft2, it means one 10 feet length whose width is 1 feet cover the area of 10 sq ft, similarly ten feet length and ten feet width spread into hundred square feet.
12 inches equal to 1 feet in length. So, 12*12 = 144 sq inches that is 1 sq ft. Square Feet is an imperial unit and U.S. customary unit of area measurement popularly used in United States and partially in Bangladesh, Canada, Ghana, Hong Kong, India, Malaysia, Nepal, Pakistan, Singapore and the United Kingdom etc.
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Very nice knowledge