A virtual private network (VPN) can hide your Internet habits from your Internet Service Provider (ISP) and protect your privacy online for starters. For travelers, VPNs can get you cheaper airfare or access the free Internet in places with censorship but being so closely tied to your browsing habits, you need to choose the right VPN. Free VPNs make money through advertising and selling your information since they have no intrinsic incentive to provide good privacy. Never use a free VPN. Speed is also a particularly good on ExpressVPN (all VPNs will slow down your total Internet speed somewhat when in use).