C++ ships a meal cooked for your kitchen; bytecode ships a recipe any kitchen can cook.

A C++ compiler translates your code into the native instructions of your own processor, and the result runs directly on the machine. No virtual machine sits in between and no garbage collector runs alongside. The price is that a build for one operating system will not run on another, so you recompile for each.

Read it once, then a question tests whether the trick stuck.