A "virtual private network" is the 21st Century way of working from home or from a remote office. By using the internet to extend your company's office network across many kilometers, it is possible to log into your office computer account from most any Internet connection. There are hacker and eavesdropping concerns, of course. But gratefully, modern VPN's are quite safe. Bradley Mitchell explains VPN's here...

VPN’s are incredibly helpful I’ve been using one for the last two years, and it’s has helped me become way more productive.
george s may
So is a vpn a small businesses answer to establishing an expensive, complicated server? What’s the difference between using, say an exchange server vs a vpn?
Exchange is an email server
I can also be called a kind of remote desktop connection.