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I would like to give you a simple answer just in case someone doesn't know the difference, so I will make it simple and short.
VPN - you don't have to be in a specific location to use it as long as you have an access permission to the other location. the speed of the connection depending on the speed of the internet. it's free connection because you use the internet connection.
Leased Line - you have to be in specific location to use it. it's high speed connection . you pay monthly to use this connection and it's expensive.
