OWS - OGC Web Service.
OGC - Open Geospatial Consortium. International voluntary consensus standards organization. Develop and implements standards for geospatial content and services, GIS data processing and exchange.
WFS - Web Feature Service. Allow requests for geographical features across the web. It is a OGC specification.
KML - Keyhole Markup Language. XML format used by Google to represent 3D geographic information.
Feature - Entity with a geographic location, typically describable by (for example) points, arcs, or polygons.
CRS - Coordinate Reference System