This document provides an introduction to Arabic nouns. It discusses two types of nouns: indefinite nouns and definite nouns. Indefinite nouns are common nouns that are general names for living or non-living things. Definite nouns are either proper nouns or indefinite nouns with the definite article "al-" added. It provides examples of both types of nouns and explains how to make an indefinite noun definite by adding the definite article. Possessive constructions are also summarized, noting that the definite article is dropped from the first noun in such cases.