The Middle East is a geopolitical region, not an ethnic or linguistic monolith. Of the ~18 countries typically included:
Saudi Arabia, UAE, Qatar, Bahrain, Kuwait, Oman, Yemen, Iraq, Syria, Jordan, Lebanon, Palestine, Egypt, Libya, Algeria, Tunisia, Morocco, Mauritania, Sudan, Somalia, Djibouti, Comoros. (Core Middle East Arab states: ~14)
(Afghanistan, Pakistan sometimes included; also non-Arab.)
Key distinction: "Arab" = Arabic-speaking, Arab-identity populations. "Middle East" = geographic/political region. They overlap heavily but are not identical.