A virtual private network (VPN) is basically a secure tunnel across a public network that enable users to send and receive data across shared or public networks as if their computing devices were directly connected to a private network. There are two main types of VPNs: remote access and site-to-site. Discuss the key differences between remote access VPNs and site-to-site VPNs and describe a situation where we would need a remote access VPN and another situation where site-to-site would be a better choice.