WOA stands for Web Oriented Architecture, which combines Service Oriented Architecture (SOA) with Representational State Transfer (REST) and World Wide Web technologies. It aims to make machine-to-machine interactions as easy as human-to-machine interactions on the web by leveraging existing web standards like HTTP, HTML, and URIs. The key aspects of WOA are using REST as an architectural style with stateless operations, standard formats like HTML and HTTP, and making applications easily extensible through the composition of other systems.