In English, the articles are "a," "an" and "the." Some grammarians also classify "some" as an article in some usages.
In Spanish, the articles are un, una, unos, unas, el, la, los and las.
Articles can be classified as definite or indefinite. The definite articles are "the" in English and el, la, los and las in Spanish. The indefinite articles are "a" and "an" in English (also "some" if that word is so classified) and un, una, unos and unas in Spanish.
Note that Spanish and English have different grammatical rules concerning when articles are needed or should be omitted.

