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A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
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What is a node?

A Node or Network Node is a server running specialized software that initiates and responds to requests for environmental information from Exchange Network partners. The requests and responses use common formats expressed in eXtensible Markup Language (XML) and conform to the Exchange Network protocol and specifications. A Node can initiate the submission of data, request data from another node, and respond to a request for data from another node or an application making a data query over the network. Sending data in response to a query is known as publishing. Nodes allow for machine-to-machine communications, which means that data exchanges can be automated. A node has an administrative interface that lets its owner configure and operate it.