Why there are multiple ways to do same operation in SharePoint?

Hello Experts,
I am bit confuse when I was learning on RESTful service these days. We can accomplish CRUD operations on SharePoint list via RESTful. My question here is, the same we can achieve via SharePoint Object Model, CSOM (.Net and Java), LINQ to SP.
SharePoint developer has to learn and invest their time efforts to learn NEW things to achieve the same result which they can achieve by what they have already learned but due to client / organization demand they have to learn new things. Can anybody please
explain me why Microsoft is doing this?
Thanks, Chintan

Hi,
You have to choose technologies (REST , CSOM and Javascript) based on your requirement.
Suppose you want to target multiple OS and devices (beyond your network ) to be accessed your SharePoint data , then you can use the RESTful service.
CSOM is the best option to connect your SharePoint server through webservice instead of writing server side code that will sit on server and using the extra system resources.
You wanted some SharePoint data from the traditional webapplication (html or asp.net form) that hosted in the same server where your SPServer installed,you can choose Javascript Object Model or CSOM. It also can be used with all types of new SharePoint
application Model (apps).
LinQ to SP is the best option if you wanted to develop the entity based client application (Silverlight and LightSwitch).
Murugesa Pandian. | MCPD | MCTS | SharePoint 2010

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