Hola's goal is to make the internet faster, more open, and cheaper to operate.
Hola built a peer-to-peer overlay network for HTTP, which securely routes the sites you choose through other Hola users' devices and not through expensive servers.
Hola never takes up valuable resources from these users because it only uses a user as a proxy if that user's device is completely idle (by idle we mean that the device is not using battery but is connected to electricity; no mouse or keyboard activity has been detected; and the device is connected to the internet).
Like any P2P network, Hola is a "value exchange" network - you get the Hola service for free (on PC and Mac), and in exchange you provide a certain amount of network and processing power when your computer is not in use. To provide you its functionality, Hola sometimes needs to route your services through peers (other people's devices) on the Hola network.
In return, some of their traffic is also routed through your device securely.
These servers are then used for routing your traffic in order to change your IP, making you more secure and anonymous.
In addition, these VPN companies need to pay bandwidth bills for their users' traffic. This built-in cost, coupled with the need of any company to turn a profit, makes a traditional VPN service quite expensive for the end-user (typically around per month).
Sign up for Hola premium here VPNs have existed for almost as long as the Internet.
VPN companies need to set up and maintain servers in various countries.
When your device is not in use, other packets of information from other people may be routed through your device.