Demotic Greek is a modern form of the Greek language that evolved from Koine Greek, the common language of the Eastern Mediterranean during the Hellenistic and Roman periods. It became the standard spoken language in Greece and among Greek communities worldwide, particularly from the 19th century onward. Demotic Greek is characterized by its simplified grammar and vocabulary compared to earlier forms of Greek, such as Ancient Greek. It was officially recognized as the language of instruction in Greek schools in the 20th century, reflecting the cultural and social changes in Greece.