VPN (Virtual Private Network)      
A Virtual Private Network       is a method or technique to connecting your private network       using public network (Internet) with privacy, security       through encryption and others security measures. Using VPN       you can communicate between two different locations across       Internet with low cast and security. 
            The speed of sharing data       using VPN depends upon your internet speed, if you are using       cable internet or DSL to connect two different location       for VPN then your data flow is much faster than any dial-up       VPN connection. 
How to Install VPN       Server and VPN Client?
To configure VPN server       and VPN client, first confirm that both ends  (client       computer and server computer) are connected to Internet.
VPN Server 
- First click on Start button then Control Panel > Administrative Tools, here open the option Routing and Remote Access.
 - Browse the server name and then click the option Configure and Enable Routing and Remote Access from the Action menu, and then click the Next button. Then you will find the Virtual Private Network option in the Common Configurations dialog box. Here select the option Virtual Private Network and go for Next.
 - Here select the option Yes, all of the available protocols are on this list then click Next, In next step select the Internet connection option to connect internet.
 - In IP Address Assignment dialog box, select Automatically if you want to use DHCP server for IP address, otherwise you can your static IP address here if you have.
 - Here you will get a dialog box with name Managing Multiple Remote Access Server, check the option No, I don't want to set up this server to use Radius now and Finish it.
 
VPN Client
- On the Client computer first connect Internet connection to make VPN setup.
 - Click Start Button and sitting then go to option Network and Dial-up Connections.
 - Here click on Make New Connection, select the option here Connection To a Private Network Through the Internet and Next.
 - Select first option Automatically Dial this Initial Connection, if you are using dial-up connection, otherwise select Do not dial the Initial Connection, if you are using cable internet.
 - In next step type the       IP address of the computer to which you want to        connect, then go Next and select option For All Users        or Only for Myself, according to your        requirement. Click Next and finish the connection. read more