In Romanian grammar, nouns are classified as both countable and uncountable. Countable nouns (substantive numărabile) are those that can be counted, for example, “o carte” (a book), “două cărți” (two books). On the other hand, uncountable nouns (substantive nenumărabile) can not be counted, for instance “lapte” (milk), “apa” (water). Furthermore, uncountable nouns are usually not used in plural form. Comprehending the distinction between countable and uncountable nouns is essential to understand Romanian language better.