Articles accompany nouns and indicate gender (masculine or feminine) and number (singular or plural). In Spanish grammar, there are indefinite articles (un, una, unos, unas - in English "a", "an") and definite articles (el/los, la/las, lo - in English "the").
The masculine definite articles are el (singular) and los (plural).
The feminine definite articles are la (singular) and las (plural).
Indefinite articles (a, an):
The masculine indefinite articles are un (singular) unos (plural).
The feminine indefinite articles are una (singular) and unas (plural).
NB! Usually the words ending with -o or -e are masculine and the words ending with -a are feminine.
The word "mother" is a feminine word, "la madre", just like the word "woman" is a feminine word "la mujer".
The words that end with -ión are feminine words (una estación - a season, una región - a region).
The word "ciudad" is a feminine word "una ciudad" (a city).
