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"El" is a form of "el", a definite article which is often translated as "the". "Pez" is a noun which is often translated as "fish". Learn more about the difference between "el" and "pez" below.
el()
A definite article is a word that identifies a noun as specific or known to the speaker (e.g., the girl).
el pez()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
2. (material)
