If you say Y here, it will be possible to plug wrapper-driven binary
formats into the kernel. You will like this especially when you use
programs that need an interpreter to run like Java, Python, .NET or
Emacs-Lisp. It's also useful if you often run DOS executables under
the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
<http://www.tldp.org/docs.html#howto>). Once you have
registered such a binary class with the kernel, you can start one of
those programs simply by typing in its name at a shell prompt; Linux
will automatically feed it to the correct interpreter.

You can do other nice things, too. Read the file
<file:Documentation/admin-guide/binfmt-misc.rst> to learn how to use this
feature, <file:Documentation/admin-guide/java.rst> for information about how
to include Java support. and <file:Documentation/admin-guide/mono.rst> for
information about how to include Mono-based .NET support.

To use binfmt_misc, you will need to mount it:
mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc

You may say M here for module support and later load the module when
you have use for it; the module is called binfmt_misc. If you
don't know what to answer at this point, say Y.

source code:

fs/binfmt_misc.c