VPN is a virtual private network. It bolsters your internet security. It's a group of computers networked over the internet (businesses connecting to remote databases, workers that are trying to access a network when they are not on a local area network.)
Apple's iOS natively allows one to use VPNs... no additional apps needed...VPN is Virtual Private Network which is use for unblock website or access securely at public WiFi networks. First you need to install a VPN software such as CyberGhost, Hotspot Shield, Spotflux etc then you can use it