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"Eso" is a form of "eso", a pronoun which is often translated as "that". "Lo que" is a phrase which is often translated as "what". Learn more about the difference between "eso" and "lo que" below.
eso(
eh
-
soh
)
A pronoun is a word that stands in for a noun (e.g., she).
pronoun
a. that
Eso fue lo que me dijo.That's what he told me.
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lo que(
loh
 
keh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. what
No sé lo que quiero para mi cumpleaños.I don't know what I want for my birthday.
Lo que no entiendo es cómo entró el ladrón a la casa.What I don't understand is how the thief entered the house.
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