Nouns have number: they can be singular (one) or plural (more than one). In order to make them plural, we add –s at the end, or –es if the noun ends in a consonant. Guitarra → Guitarras. Doctor → Doctores.
Nouns in Spanish have gender (they can be either masculine or feminine). A piano (piano) is masculine, while a guitarra (guitar) is feminine. Notice how piano ends in –o and guitarra ends in –a. It is quite common for masculine and feminine nouns to end in those letters respectively, but it is not a rule. So, in order to memorize the gender of nouns, we are going to learn all of them together with the article.
