1) An indirect object indicates to or for whom an action is carried out and is expressed in Spanish with an indirect object pronoun and the preposition "a". 2) The indirect object pronouns in Spanish are "me", "te", "le", "nos", "os", "les" and they can represent relationships of "to", "from", or "for". 3) For clarity, the prepositional form accompanying the indirect object pronoun is often used, such as "a mí", "a ti", etc. The repetition of the indirect object pronoun and accompanying preposition is required by Spanish grammar.