vs
QUICK ANSWER
"Si" is a form of "si", a conjunction which is often translated as "if". "El" is a form of "el", a definite article which is often translated as "the". Learn more about the difference between "si" and "el" below.
si()
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
el()
A definite article is a word that identifies a noun as specific or known to the speaker (e.g., the girl).
