What are the requirements for building a Web Mapping and analysis Site? [on hold]

[المشرف العام]

I want to make a site like bhuvan in which it can provide different layers of information and also tools for performing GIS analysis

I know three main requirements :

• client side scripting (openLayers)
• Webservices (Mapserver) + Tiling/Caching Services
• Database (PostGIS)

I have ArcGIS desktop installed on my computer...and we can digitise many of the layers.

My questions are :

1. How can I put these layers I created in ArcGIS in my website i.e., how to publish these maps to any open webservices.
2. For what purpose we need Database like postGIS. How are webservices differ from databases. With out database, can we build awebGIS?

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