There are two common business types. A remote access VPN connects one laptop or phone to the office network through an app, so the user can reach file shares and internal systems from anywhere. A site-to-site VPN permanently links two locations, such as two offices or an office and a cloud network, through their firewalls. In both cases the traffic is encrypted in transit.
A VPN lets staff use systems that should never be exposed directly to the internet, such as a file server, an accounting package, or remote desktop. It is also how many small businesses join branch offices without paying for private lines. Consumer VPN services sold for privacy are a different product: they hide your browsing from the local network but do not connect you to your office.
A VPN usually gives the connected device broad access to the network, so a stolen login or an infected laptop gets the same reach. Require multi-factor authentication, limit what VPN users can access, and keep the VPN device patched, because flaws in these products are actively targeted by attackers. For cloud-only businesses a VPN may be unnecessary. We set up and maintain business VPNs alongside firewalls and remote access.