Demonstrative pronouns are divided into three sets according to the distance at which it is drawn with the issuer. It also presents changes in gender and number. So are these series:
Éste, ésta, esto, éstos and éstas denote proximity to the objet or person regarding the speaker.
Ése, ésa, eso, ésos and ésas denote proximity to the object or person respect to the receiver.
Aquél, aquello, aquella, aquellos and aquellas denote distance from the object or person regarding the sender and receiver.