My Definition of what a Virtual Assistant is:

A Virtual Assistant is a person who works for many clients, providing office administration tasks, communicates with clients via telephone, email, skype; we may never meet our clients face to face. A person who works independently from his/her own virtual office.
An office administration person, with at least 10 years worth of office experience as a PA/Secretary or Office Manager. A person who can work alone.
A person with exceptional time management and prioritisation skills.
Someone who can run an office and liaise with clients on an ongoing basis.
Someone with a bit of management experience, can learn quickly and who is at ease with software.
We have to be pro-active and assertive.
Virtual Assistants are Business Owners. Who run their own companies, do their own marketing, networking, bookkeeping etc.