This is the 130th most frequent Spanish word.
esto
"This" (used for something close to the speaker).
'Esto' is a neuter demonstrative pronoun referring to something unspecified or neutral.
Esto es una manzana.
This is an apple.
'Esto' highlights a specific statement or idea mentioned before.
Esto que dijiste no es correcto.
This that you said is not correct.
'Esto' is used as a subject to refer to an unspecified situation or thing that the interlocutors are aware of.