What is SDK....and what are there feature?

before you post a question you should browse some of the old questions… this has been asked so many times by other users…

Software development kit :)

As mcw says, it’s a Software Development Kit. This is for programmers to make applications for a specific platform.

If you’re an enduser who just uses the device or system, the technicalities of this don’t really matter. All it means is that there will be more applications for you now that the developers have the tools they need to make it.