The Sandbox node is a server designed for development. The data set for the sandbox is different than that for organizations, and is intended for development and testing,
not live deployment.
Nodes
Salsa is deployed across hundreds of groups in chunks called 'Nodes'. A node is a set of organizations with similar goals and missions -- or may be a single organization
with many child organizations. The details are better explained elsewhere, but suffice to say that when code is deployed, it is deployed for all nodes,
but to access data from an organization you must go to that organization's specific node.