Stands for “Graphical User Interface.” Means a visual representation of the functional code. Or, is a way for the average web user to interface with a database, program, etc.

GeoRSS is an emerging standard for encoding location as part of an RSS feed. (RSS is an XML format used to describe feeds ("channels") of content, such as news articles, MP3 play lists, and blog entries. These RSS feeds are rendered by programs such as aggregators and web browsers.)
In GeoRSS, location content consists of geographical points, lines, and polygons of interest and related feature descriptions. GeoRSS feeds are designed to be consumed by geographic software such as map generators. By building these encodings on a common information model, the GeoRSS collaboration hopes to promote interoperability and "upwards-compatibility" across encodings.
At this point, the GeoRSS collaboration has completed work on two primary encodings which they call GeoRSS GML and GeoRSS Simple. GeoRSS GML is a formal OGC GML Application Profile, and supports a greater range of features than Simple, notably coordinate reference systems other than WGS84 latitude/longitude. There is also a W3C geo GeoRSS serialization, which is older and partly deprecated but still most widely used.

A GIS (geographic information system) enables you to envision the geographic aspects of a body of data. Basically, it lets you query or analyze a database and receive the results in the form of some kind of map. Since many kinds of data have important geographic aspects, a GIS can have many uses: weather forecasting, sales analysis, population forecasting, and land use planning, to name a few.

The Geography Markup Language (GML) is the XML grammar defined by the Open Geospatial Consortium (OGC) to express geographical features. GML serves as a modeling language for geographic systems as well as an open interchange format for geographic transactions on the Internet. Note that the concept of feature in GML is a very general one and includes not only conventional "vector" or discrete objects, but also coverages (see also GMLJP2) and sensor data. The ability to integrate all forms of geographic information is key to the utility of GML.

Google Maps (for a time named Google Local) is a free web mapping service application and technology provided by Google that powers many map-based services including the Google Maps website, Google Ride Finder and embedded maps on third-party websites via the Google Maps API. It offers street maps, a route planner for bicycles, pedestrians (routes less than 6.2 miles[1]) and cars, and an urban business locator for numerous countries around the world.