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"Mensajes" is a form of "mensaje", a noun which is often translated as "message". "Electrónicos" is a form of "electrónico", an adjective which is often translated as "electronic". Learn more about the difference between "mensajes" and "electrónicos" below.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. message
Por favor, deje un mensaje y le volveré a llamar tan pronto como sea posible.Please leave a message and I will call you back as soon as possible.
An adjective is a word that describes a noun (e.g., the big dog).
1. (general)
a. electronic
Las computadoras y las tabletas son dispositivos electrónicos comúnmente utilizados.Computers and tablets are some commonly used electronic devices.