Jaffa is one of the oldest known port cities in the world, it is being referred to in ancient Egyptian scriptures from the 15th century BC. Later it served as the main port of the Holy Land. In ancient time and in Hebrew it was known as Yafo(still being used today) and with the Arab conquests of the land in the 7th century the name has changed to Yaffa in Arabic or Jaffa in English.
Today Jaffa is a part of Tel Aviv.