Lumia 635 8.1 Update question - what is it?

[Windows Central Question]

My Lumia 635 is on 8.1 and I am being prompted for a phone update but cant work out what it is for. I don't want to install something unnecessarily. Can anyone advise?

 

[glossallalia]

My Lumia 635 is on 8.1 and I am being prompted for a phone update but cant work out what it is for. I don't want to install something unnecessarily. Can anyone advise?

Are you a windows insider? Or developer preview?

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