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QUICK ANSWER
"El" is a form of "el", a definite article which is often translated as "the". "Un" is an indefinite article which is often translated as "a". Learn more about the difference between "un" and "el" below.
un(
oon
)An indefinite article is a word that indicates that a noun is not specific (e.g., a girl).
1. (singular)
b. an (before vowel sound)
Tienen una vieja cámara que todavía funciona.They have an old camera which is still working.
el(
ehl
)A definite article is a word that identifies a noun as specific or known to the speaker (e.g., the girl).