This document discusses Nintex Xtensions, which is an extensibility framework that allows developers to easily interact with and expand the capabilities of the Nintex Workflow Platform. Nintex Xtensions simplifies the development of customized, repeatable, and scalable workflow applications. It allows building custom connectors that let automated processes interact with any system, and connecting legacy on-premise systems to modern SaaS apps. Connectors can call any REST API endpoint or work across multiple Nintex workflows.