It's different from ordinary corn. Popcorn, the special corn for popcorn, is different from ordinary corn in appearance, size, source and variety. The ears and grains of popcorn are smaller than ordinary corn, and the structure is compact, hard and transparent, and it has great expansion and explosion at high temperature, even if the grains are smashed into pieces, it will not lose its expansion and explosion power. Popcorn got its name from this. Seeds are mostly yellow or white, but also red, blue, brown and even variegated. Ordinary corn stems are erect, generally unbranched, 1 to 4 meters high, and each node at the base has air-supported roots. Leaf sheaths have transverse veins; Ligule membranous, about 2 mm long; Leaf blade is flat and broad, linear-lanceolate, base is round and auriculate, hairless or flawed, midvein is thick, and the edge is slightly rough. The terminal tassel is large, and the main axis, raceme axis and axil are puberulent.