Demotic (popular) is a term for a late form of cursive writing used from the 15th Dynasty on (c. 1674-1567 B.C.), also called Enchorial (native)...it is a simplified version of Hieratic. The names are of Greek origin.
The word "demotic" is also used in other senses, as for the more popular form of modern Greek (as opposed to katharevousa, the "purified" or more old-fashioned form of the modern language).