A walking foot is a foot with feed dogs, or a similar fabric moving mechanism. This is useful when there are many layers of fabric or slick fabric. Then the top layer of fabric can be made to travel at the same rate as the lowest layer (the feed dogs) or an slightly different rate. Then the fabric layers will stay even for the entire length of the seam.
A walking foot sewing machine has this feature built in. Thus you don't need to adjust extra hardware to keep your fabric aligned. (On some, specific feet are needed to use the feature. However, it is easier to adjust than the separate walking foot that I have for my older Singer sewing machine.)
I hope this helps.
Cindy Wells
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