A heel fetish is one of the more common interests people run into, and it rarely gets explained in plain terms. High heels sit at the meeting point of style, posture, and sound, so they pick up meaning from a lot of directions at once. Most of what draws people in is not complicated, it is just a matter of details that are easy to miss when you are not looking for them.
What a heel fetish usually means
In general, a fetish is a strong, lasting focus on a specific object, body part, or situation. When people talk about a heel fetish, they usually mean that shoes, and the way someone stands and moves in them, carry a lot of that focus. For some it is about the shoes themselves. For others it is about the whole picture: the posture, the line of the leg, the way weight shifts onto the ball of the foot.
It is worth being clear that this is not one single thing. Two people can both say they have a heel fetish and be responding to completely different details. One might care about the shape of the arch, another about a specific style like a stiletto or a block heel, another about the sound on a hard floor. The label is broad on purpose.

If you are new to the vocabulary around this, it helps to read how people define related terms. Our heel fetish glossary entry covers the basic definition and the way the term gets used in practice.
Why heels draw attention
Heels change how a person stands. They shift weight forward, lift the heel, and push the calf and the posture into a different shape. That change is visible from across a room, and it reads as deliberate. A person in heels is usually choosing to be seen in a certain way, and that choice is part of what people respond to.
There is also a sound element that tends to get underestimated. A hard heel on a hard floor makes a clear, repeating noise. That noise tells you someone is moving toward you or away from you before you see them. A lot of people who describe a heel fetish mention the sound first, before they mention anything visual.
A heel fetish is usually less mysterious than it sounds once you break it down. It tends to be about posture, sound, styling, and the small choices someone makes when they get dressed, and those things are visible in a lot of ordinary photos.

If something in this area interests you, looking at more sets and reading the glossary entries is a reasonable next step. There is no single correct way to be interested in any of it.