arch: This command displays the architecture of the operating system kernel.
uname -m: This command displays the architecture of the machine (hardware) on which you are running the command. The machine is an x86_64, which is a 64-bit architecture.
The operating system is emulating the i386 architecture to run 32-bit applications, even though the underlying machine is a 64-bit x86_64.
The x86_64 architecture is compatible with the i386 (32-bit) architecture through a technique called “compatibility mode” or “emulation mode”. This allows 32-bit programs to run on a 64-bit machine without having to recompile them.
It is a machine with x86_64 (64-bit) architecture.
You can run 64-bit programs without problems, since the operating system and libraries are compiled for the x86_64 architecture.
You can run 32-bit programs thanks to support for the i386 architecture.