What is Difference Between Wss And Moss ? Why Wss Or Why Moss ?

As a beginner of SharePoint when I start looking at books and blogs I was very confused about what really is the difference so I have started going in more depth but the real difference I found when I started installing both of them, So let’s go through my experience and you will come to know what is the difference. I hope so ;)
First rule of learning , Forget everything you have in mind before , think like you are new to SharePoint and have never seen or heard about sharepoint,Here we go now ..
When we install windows 2003 server Microsoft is offering you many free software’s like notepade,sound recorder etc but Microsoft gives you one thing more which is a Website which can be used within an organization for sharing documents or messaging each other and many other collaborative things , so what is that free thing called ? That free thing is SharePoint portal, Microsoft is giving it for free but why organizations of world are buying Microsoft Office SharePoint Server in $45000 for their organization if it is free with windows server 2003,The reason is of features , What Microsoft gives for free have few features in it but if you want all features you have to buy it from Microsoft ,I think it is very simple …
Note : Add and remove program of windows server have Microsoft SharePoint Portal Free one , If it is not there Download it from Microsoft Site for Free

Now Wss And Moss :-

Well think of 3 tier application in which there is a presentation layer , business logic layer and Data layer , Presentation layer have Web Forms ( ASPX ) logic behind these forms Call functions in Business Logic Layer , Now if you create a business logic Layer and expose methods and function and classes so you are basically giving opportunity to Others to use that business logic Layer ( DLL ) , Microsoft have done the same thing They created a Complete Web Portal ( SharePoint ) on Asp.net and given opportunity to developers to do whatever they want by using their DLL ( Windows SharePoint Services ) , you can have it with the free version but API is limited but when you buy Microsoft Office SharePoint Server (MOSS) you get many other things in that portal , It is same like we buy a trial version with limited functionality and buy full Version by giving Extra amount .
Now many organizations are happy with WSS and I am sure that Free version is also very much usefull and can be used by organizations for Intranet Portals ( Portals runs inside organization ) and if organization need more features then they have to buy Complete version . Even if you want to make that Intranet Portal ( Inside Organization) to run on Internet ( Outside Organization ) You have to pay money 

Difference in Development:-

It is very obvious that if you are developing web parts and other controls on free version you will not get benefit of other functions and methods given by Microsoft in full version ,but you can develop any thing using that basic DLL ( WSS )

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