VPN stands for Virtual Private Network and can be vital to certain businesses and individuals. One of the main reasons to use a VPN for business is to connect to a company LAN that you have no way of physically connecting to. So this is useful if you have multiple offices or operate around the world. A VPN connection is also secure which means that the data transmitted between your computer and the network are protected. This is important due to the fact that there are increasing dangers around the web, waiting to steal information from the web.
Another reason to use a VPN which applies to both individuals and companies is that some websites and services are region-locked. By activating a VPN you are able to make the service think that you are connected to a network within that specific region.