A pyramid is a building where the outer surfaces are triangular and converge at a point. The base of pyramids are usually quadrilateral or trilateral (but may be of any polygon shape), meaning that a pyramid usually has four or five faces. A pyramid's design, with the majority of the weight closer to the ground, means that less material higher up on the pyramid will be pushing down from above: this allowed early civilizations to create stable monumental structures.
For thousands of years, the largest structures on Earth were pyramids: first the Red Pyramid in the Dashur Necropolis and then the Great Pyramid of Khufu, the only one of the Seven Wonders of the Ancient World still remaining. The largest pyramid ever built, by volume, is the Great Pyramid of Cholula, in the Mexican state of Puebla. This pyramid is still being excavated.
A pyramid scheme is a non-sustainable business model that involves the exchange of money primarily for enrolling other people into the scheme, often without any product or service being delivered.
Pyramid schemes are illegal in many countries, including the United States[1], the United Kingdom, France, Germany, Canada, Romania[2], Colombia[3], Malaysia, Norway, Bulgaria, Australia[4], New Zealand[5], Japan[6], Nepal[citation needed], Philippines[7], South Africa[8], Sri Lanka[9], Thailand[10], Iran[citation needed], and the People's Republic of China
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