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QUICK ANSWER
"Por qué" is a form of "por qué", a phrase which is often translated as "why". "Porque" is a form of "porque", a conjunction which is often translated as "because". Learn more about the difference between "por qué" and "porque" below.
por qué(
pohr
keh
)A phrase is a group of words commonly used together (e.g., once upon a time).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
porque(
pohr
-
keh
)A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
a. because
Mi hermano está triste porque no ganó el concurso.My brother is upset because he did not win the contest.