Geo web application development involves creating web-based applications that incorporate geospatial data and mapping technology to provide users with interactive maps and geospatial analysis tools. Geo web applications can be used in a variety of industries, including urban planning, rural planning, environmental management, natural resource management,  transportation, and emergency management, among others.

key technologies and tools used in geo web application development include:

1. Geospatial data: Geo web applications use geospatial data, which includes data on the physical characteristics and location of objects and features in the environment. This data can be sourced from various public and private sources, including satellite imagery, aerial photography, and government databases.

2. Mapping technology: Geo web applications use mapping technology to display geospatial data in an interactive format. Popular mapping technologies used in geo web applications include Google Maps, OpenLayers, and Leaflet.

3. Programming languages: Geo web applications can be developed using a variety of programming languages, including JavaScript, Python, and Ruby on Rails.

4. Geospatial analysis tools: Geo web applications often incorporate geospatial analysis tools that allow users to perform spatial analysis and modelling, such as proximity analysis, spatial clustering, and spatial regression.

5. Web Server: A web server is a software application that delivers web pages and other content over the internet to clients or users. The web server receives requests from clients, typically web browsers, and responds with the requested content. A web server can serve static content, such as HTML, CSS, and images, as well as dynamic content, such as scripts and databases.