The lasso tool is similar to the "marquee" tool, however, the user can make a custom selection by drawing it freehand.
There are three options for the "lasso" tool – regular, polygonal, and
magnetic. The regular "lasso" tool allows the user to have drawing
capabilities. Photoshop will complete the selection once the mouse
button is released. The user may also complete the selection by
connecting the end point to the starting point. The “marching ants” will
indicate if a selection has been made. The "polygonal lasso" tool will
only draw straight lines, which makes it an ideal choice for images with
many straight lines. Unlike the regular "lasso" tool, the user must
continually click around the image to outline the shape. To complete the
selection, the user must connect the end point to the starting point
just like the regular lasso tool. "Magnetic lasso" tool is considered
the smart tool. It can do the same as the other two, but it can also
detect the edges of an image once the user selects a starting point. It
detects by examining the color pixels as the cursor move over the
desired area. A pixel is the smallest element in an image. Closing the
selection is the same as the other two, which should also should display
the “marching ants” once the selection has been closed.
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