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QUICK ANSWER
"El" is a form of "el", a definite article which is often translated as "the". "La cual" is a phrase which is often translated as "that". Learn more about the difference between "el" and "la cual" below.
el(
ehl
)A definite article is a word that identifies a noun as specific or known to the speaker (e.g., the girl).
la cual
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. that (things, animals)
Esta es la serie de TV sobre la cual te hablé. ¡Es buenísima!This is the TV show that I told you about. It's really good!
b. which (things, animals)
Ordenamos la sopa de Spam, la cual se veía buena en la foto, pero resultó ser asquerosa.We ordered the Spam soup, which looked good in the picture, but it turned out to be disgusting.
