Definite Articles (A fancy way to say "the")
Definite articles are Adjectives. So, that means they have to Agree in Gender and Number.
| 
       English  | 
    
       Spanish  | 
  ||||
| Singular | Plural | Singular | Plural | ||
| Masculine | The | The | Masculine | El | Los | 
| Feminine | The | The | Feminine | La | Las | 
Some Examples:
| 
       English  | 
    
       Spanish  | 
  ||||
| Singular | Plural | Singular | Plural | ||
| Masculine | The chicken | The chickens | Masculine | El pollo | Los pollos | 
| Feminine | The roach | The roaches | Feminine | La cucaracha | Las cucarachas |