WebDynpro for ABAP is a framework for Web development that runs on top of BSP.
BSP in a nutshell: You can create BSP applications in SE80, Add a page to your application. Now you can code normal web page in HTML as in any other Web server. If you need to insert ABAP code, just embrace the code in <% ... %> tags, like you do in ASP.NET or JSP.NET
There is also the HTMLB extension for BSP, a macro language that makes pages easier to create. There are also many tutorials in SDN.
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