vs
QUICK ANSWER
"Aquella" is a form of "aquella", an adjective which is often translated as "that". "Ella" is a pronoun which is often translated as "she". Learn more about the difference between "ella" and "aquella" below.
ella(
eh
-
yah
)A pronoun is a word that stands in for a noun (e.g., she).
c. it (things or animals)
Esa es mi casa. Detrás de ella hay un garaje.That's my house. Behind it, there's a garage.
aquella(
ah
-
keh
-
yah
)An adjective is a word that describes a noun (e.g., the big dog).
a. that
A pesar de estar lejos, aquella casa es la más bonita de todas.Despite the fact that it is far away, that house is the prettiest of them all.