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"El sábado" is a form of "sábado", a noun which is often translated as "Saturday". "En" is a form of "en", a preposition which is often translated as "in". Learn more about the difference between "el sábado" and "en" below.
el sábado(
sah
-
bah
-
doh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. Saturday
El sábado es el mejor día de la semana porque no hay escuela.Saturday is the best day of the week because there's no school.
en(
ehn
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).