Virtual Private Network - creates a secure connection over the internet between your device and a private network. Like having a private tunnel through a public highway.
Remote employees use VPN to securely access company files and systems as if they were in the office.
All providers offer managed IPsec VPN for site-to-site connectivity between networks. AWS and Azure also provide managed client VPN options for individual users (remote access). Feature sets differ by throughput, routing (BGP), HA options, and integration with hub-and-spoke networking.