What is Assets.car file in .app?

Question

I was looking at the contents of my application and I found the file Assets.car in the resources folder of my application along with some nibs:

My question is: What is this file and what does it have to do with the application? What kind of data does it contain?

Answer 1

Assets.car file

When you build a project all your non empty assets .xcassets which are added to Build Phases -> Copy Bundle Resources will be compiled into Assets.car file, which is generated by Xcode during building and set up by Build Settings -> Asset Catalog Compiler

[Open Assets.car]

Answer 2

It is the "compiled" version of the assets catalog.