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"This one" is a phrase which is often translated as "este", and "this" is a pronoun which is also often translated as "este". Learn more about the difference between "this one" and "this" below.
this one(
thihs
wuhn
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. este
He's written a lot of books, but this one is the best.Ha escrito muchos libros, pero este es el mejor.
I like that shirt, but they only have this one in my size.Me gusta esa camisa, pero solo tienen esta en mi talla.
this(
thihs
)A pronoun is a word that stands in for a noun (e.g., she).
d. así
Is this enough for you or would you like a bigger piece?¿Así te llega o quieres un trozo más grande?
An adjective is a word that describes a noun (e.g., the big dog).
a. este (masculine)
This winter has been the coldest one in twenty years.Este invierno ha sido el más frío en veinte años.