Windows Subsystem for Linux (WSL) is a compatibility layer for running Linux binary executables (in ELF format) natively on Windows 10. Microsoft and Canonical partnered together to enable a genuine Ubuntu 14.04 "Trusty Tahr" image to be downloaded and extracted to the user's local machine, and for the tools and utilities contained within that image to run natively on top of the WSL. WSL provides a Linux-compatible kernel interface developed by Microsoft (containing no Linux kernel code), with user-mode binaries from Ubuntu running on top of it – a Bash shell and command language, with native Linux command-line tools (sed, awk, etc.) and programming language interpreters (Ruby, Python, etc.).