Child's plastic blocks is a term that refers to the popular building block toy known as LEGO. LEGO is a Danish company that produces interlocking plastic blocks of various shapes and sizes that can be used to construct models of all kinds. The name LEGO is derived from the Danish phrase 'leg godt, ' which means 'play well.' LEGO has become one of the most popular toys in the world, with millions of sets sold each year.