Which tool is used to select a free form user-drawn region?

The Lasso Tool is specifically designed for selecting free-form user-drawn regions in an image. This tool enables users to draw custom shapes around objects, allowing for precise selection of irregular or complex areas that geometric selection tools cannot handle effectively. The Lasso Tool is particularly useful in scenarios where the edges of the selection do not conform to straight lines or regular shapes, providing flexibility and control in the selection process.

In contrast, the Rectangular Marquee Tool can only create rectangular selections, which limits its application for free-form selections. The Polygonal Lasso Tool, while also a selection tool, is intended for creating straight-edged selections and requires the user to click at specific points, making it less suited for free-drawn areas. The Brush Tool is primarily used for painting and modifying pixels, not for making selections, reinforcing why it is not appropriate for this context.