Greek, like any other language, has a history of origins and transitions. The beginning of what we call Greek came around the 13th century BC. It then thrived in four distinct dialects, the most prominent of which (that is, Attic) came from Athens.
However, the conquests of Alexander the Great (around 330 BC) united the entire land under a single dialect, descended from Attic, that became known as Koine Greek (from the Greek word that means “common,” as you will soon learn). This version of Greek was simpler than the older version and functioned as the main language for the entire Greek empire.
Koine Greek, then, lasted until around 330 AD, at which point the language began to shift to a new form called Byzantine, from which the Greek spoken in our modern day has evolved.
While reading the rest of this chapter is unnecessary (and you may always come back later), you may certainly read on if this strikes a note of interest.