* el (masculine singular)
* la (feminine singular)
* los (masculine plural)
* las (feminine plural)
They are used before nouns to indicate that the noun is specific and known to both the speaker and the listener.
Here are some examples:
* El libro (The book)
* La mesa (The table)
* Los libros (The books)
* Las mesas (The tables)
Note:
* "El" and "los" are used before masculine nouns.
* "La" and "las" are used before feminine nouns.
* The article "lo" is used before neuter nouns (e.g., "lo bueno" - the good thing).