What is .pch file in Xcode?

It is prefix header file which is automatically created by xcode.

It is compiled and stored in cache, and automatically included in every source file during the compilation time. 

Quote from Xcode 
Note: Precompiling the prefix header will be most effective if the contents of the prefix header or any file it includes change rarely. If the contents of the prefix header or any file it includes change frequently, there may be a negative impact to overall build time.

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