What is the difference between the Lasso tool and the Polygonal Lasso tool?
You can draw a free-form selection with the Lasso tool. You click and drag with the Polygonal Lasso tool to create Rectangular Marquee selections.
The Lasso tool makes free-form selections. The Polygonal Lasso tool makes a selection with a series of connected line segments.
The Lass tool can select anything, including enclosed portions of raster images or shapes, but the Polygonal Lasso tool can select only shapes.
You can draw a free-form selection with the Lasso tool, but you must make Bezier curves with the Polygonal Lasso tool.