A “VS file” generally means a file ending with `.vs`, though the same term is used informally for Visual Studio’s `.vs` folder, so the real meaning depends on its actual source; when it’s a real `.vs` file, it’s usually a vertex shader text file for graphics pipelines and opens cleanly in editors, containing HLSL-like syntax such as `float4` with semantics like `TEXCOORD`, or GLSL-style code with `uniform` and assignments to `gl_Position`.Because the `.vs` extension isn’t bound to one official format, a `.vs` file may be plain text or binary depending on the software, and if it appears unreadable the right approach is checking what created it; but a folder named `.vs` next to a `.sln` file is Visual Studio’s cache directory containing IntelliSense/browsing data, not actual source files, and should be excluded from Git, with deletion generally safe since Visual Studio rebuilds it—though this resets local preferences such as window arrangements.“.vs” can mean universal VS file viewer because file extensions are not regulated, and Windows interprets them purely to decide what software should open them, allowing totally different programs to reuse `.vs` freely, so you shouldn’t assume every `.vs` file is a vertex shader even if that’s a common graphics pattern; another application may treat `.vs` as its own configuration file, and Windows will still list it as a “VS file” unless an installed program has claimed it.A `.vs` file can also be “something else” because usage context redefines it; in game engines it often corresponds to a vertex shader as seen alongside `.ps` or `.fs` in shader folders, but other systems may treat `.vs` as a text config or script with INI-style formatting instead of shader syntax, and in certain cases it’s binary, unreadable in editors because it holds compiled or cached data, making the file’s true identity dependent on its source and the application that successfully opens it.If you want to quickly determine what your `.vs` file means, think of the extension as a non-binding label and confirm by evidence: look at its folder neighbors, inspect the file properties for “Opens with,” and open it in a text editor to check whether it’s shader code, some other readable syntax, or binary junk—usually enough to identify it in under a minute.