Introduction,Variation Between ASP & ASP.NET

Introduction

Active Server Pages (ASP) is a server side scripting language and is a product of Microsoft Technologies. The file extension for ASP pages is ".asp". ASP pages are compiled in IIS Internet Information Server which is also a product of Microsoft.
Variations
ASP

Programming ASP websites is made easier by various built-in objects. Each object corresponds to a group of frequently-used functionality useful for creating dynamic web pages. In ASP 2.0 there are six such built-in objects: Application, Error, Request, Response, Server, and Session.
ASP.Net

ASP.Net is Microsoft's web application platform. It is based on the .NET series of technologies. It is the successor to ASP and is different in several important respects:

1. It is a fully object oriented language. Each request is treated as a request object and various methods of that object are fired as events happen on the page.
2. ASP.Net applications can be built using any language that can compile to the Microsoft .NET Common Language Runtime. In theory any language will do, but in practices ASP.Net applications are written in either Visual_Basic.NET or c# and J#.