Best Answer
Take a look at this photo:
The feet are the ruffles on the edges.
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What does it mean for a macaron to have feet?
Macaron feet are the tell-tale sign of a well-baked macaron. These little ruffles around the edge of the shell should be small and unbroken. Big and bubbly feet are often a sign that the insides have been pushed out, causing a hollow macaron. If your macarons don't have feet, it could be because your batter is too wet.How do you get good feet on macarons?
12 Tips for Perfect Macaron Feet GuaranteedWhat is the perfect texture for macarons?
Macarons should have a slight crunch with an overall chewy texture as one bites through the dessert. That texture is what truly makes a macaron marvelous.Why Are My Macarons Flat | Macaron Troubleshooting (No Feet on Macarons)
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Answer 2
A macaron (won't go into the dispute over macaron or macaroon) is a semi-foam/liquid composed of a meringue folded into tant-pour-tant (half and half of icing sugar and ground almonds). When they are baked the top shell layer of the macaron cooks and it means that the macaron can no longer expand and must rise up, this forms a frilled ruffle or foot.
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Images: George Dolgikh @ Giftpundits.com, George Dolgikh @ Giftpundits.com, Acharaporn Kamornboonyarush, Jill Burrow