ASP
ASP stands for Active Server Pages and is a Microsoft technology that enables
webpages to talk to databases and then display the results. ASP is restricted
that it can only run on servers running Microsoft server products.
ASP can be developed in either Javascript or VBScript, the latter of which we use.
ASP has been superceeded by ASP.Net although it is likely that it will be amny years before all ASP sites are replaced.
ASP.Net
ASP.Net is the current application server from Microsoft, however the framework that it operates in is much wide that just web development.
As with ASP it can be developed in a number of scripting languages with the most popular being VBscript and C#.
ColdFusion
Coldfusion was developed originally by Allaire, but is now an Adobe product. It has the advantage over the other langauages that we use in that it can run on a wide range of Server Platforms.
It is both an application server and a markup language, using tags in the code that are very similar in structure to HTML. This makes it a very easy language to learn and develop in.