A lime is a citrus fruit, which is typically round, green in color, 3–6 centimetres in diameter, and contains acidic juice vesicles. There are several species of citrus trees whose fruits are called limes, including the Key lime, Persian lime, Makrut lime, finger limes, blood limes, and desert lime.Our world depends on lime. Nowadays, lime is used : In our homes for copper, dry bleaches, dyes, glass, gold, lawn and garden neutralizers, leather, masonry, mortar, paint, paper, pharmaceuticals, plaster and stucco, sugar, table salt, toothpaste and tortilla flour.