Semites, Semitic tribe or Semitic culture was actually a term for cultural, racial or ethnic group who spoke or speak Semitic languages. But in archaeology however, this term is used informally sometimes as a kind of shorthand for ancient Semitic speaking individuals.
In racialist classification presented by Carleton S. Coon, Semitic tribe were deemed to be members of Caucasian race and with same appearance to neighboring Northwest, Indo-European, Kartvelian and Berber speaking peoples of the said region. Since the language studies are interwoven with cultural studies, the term has came to describe religions and even Semitic speaking ethnicities and histories as well that are associated by linguistic distribution and close geographic.
The truth is, some genetic studies that were recently done found out that they have common ancestry. Even though there is no significant common mitochondrial outcomes discovered, Y chromosome links between Semitic speaking individuals of Middle East (M.E) such as Hebrews, Arabs, Samaritans, Assyrians and Mandaenas showed links despite the differences contributed from the other groups.
In a DNA study of Palestinian Arabs and Jews including Bedouins, it has unearthed that these were related more to each other compared to the ones of Ethiopian Semitic tribe, Arabian Peninsula and Arabic speakers of the North Africa.
Genetic studies have indicated that modern Jews like Mizrahi, Sephardic and Ashkenazi, Arabs, Assyrians, Levantine, Maronites, Samaritans, Mandaeans, Mhallami and Maronites have ancient indigenous common near eastern heritage which can be mapped genetically back to ancient Fertile Crescent but typically display genetic profiles distinct from each other, indicating different histories of such individuals.
Semitic languages of Semitic tribe are actually branch of Afroasiatic language that’s operating in M.E. Such languages are spoken by more than 330 million people across North Africa, Western Asia as well as the Horn of Africa and also, even in the big expatriate communities in Europe and North America with smaller communities found in Central Asia as well as Caucasus.
The truth is, there are a number of proposed locations as being possible sites for prehistoric origins of Semitic tribe including The Levant, Arabian Peninsula, North Africa and Mesopotamia with most recent Bayesian studies which indicate Semitic Originated in Levant Circa around 3800 BC and later introduced to Horn of Africa in around 800 BC.
Whether you believe it or not, much of the Asia Minor and M.E speaks Semitic languages of Semitic tribe especially during the Iron and the Bronze age while the earliest attested was in East Semitic Akkadian of Mesopotamian as well as the South Eastern Anatolian polities of Assyria, Babylonia and Akkad and the East Semitic Eblaite language of kingdom of Ebla in North Eastern Levant.