Es un identificador cualquiera que puede tener letras, números, y algunos signos, ubicado a la izquierda de la arroba en una dirección de correo electrónico.

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Much has been made of the new web 2.0 phenomenon, including social networking sites and user-created mash-ups. how does web 2.0 change security for the internet? how do secure software development concepts support protecting applications?

What’s resistance in an electrical circuit ?

Larry sent an email to andy. andy didn't open larry's email but still understood what the message was. how did andy determine the message without opening the email?