A Bastion Host (AKA Jump Box) is a specialized server designed to act as a gateway between the external network (such as the internet) and the internal network.

The Bastion host is a secured and hardened single point of access to an internal network and is used to provide secured access control and auditing (often through protocols like SSH or RDP).

It is used mainly in cloud environments to provide secure access to cloud resources without exposing them directly to the internet.