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What is WSL?
WSL is a Windows feature that lets you run Linux inside your Windows computer.
- Category GitHub & code
- Also called Windows Subsystem for Linux
- Updated 20 Oct 2026
WSL, explained simply
WSL stands for Windows Subsystem for Linux. It is made by Microsoft.
It gives Windows users a Linux terminal without a second computer or a restart.
That helps because many developer tools are written for Linux or Mac.
For example, a guide for Mac or Linux can often be followed on Windows through WSL.
On ITG Now, our free tool guides mention WSL when a tool is easier to run on Windows through Linux.
Related terms
LinuxTerminalCLIVirtual machineHomebrew
Where you'll see it on ITG Now
- Guidegstack: Garry Tan's Free Claude Code Skills (2026 Guide)
- GuideOpenCut: Free CapCut Alternative, Open Source (2026 Guide)
Questions people ask about WSL
Is WSL free?
Yes. WSL is a free Windows feature.
WSL vs virtual machine: what is the difference?
WSL is built into Windows and is lighter. A virtual machine is a full separate computer inside yours.
Do I need WSL to use open-source tools on Windows?
Not always. Some tools run on Windows directly, but many guides assume Linux or Mac.