It makes your photo clearer
STRUCTURE is one of the basic functions on Instagram apps. DEFINITION is very similar function on iPhone. They are kind of Sharpness function to make your photo clearer. I recommend you to use this function after you adjust brightness and color.
It’s easy to use it. You just move the slider towards positive direction. Let us check the performance. Look at the edge! The edge can be clearly seen on the result photo.


I increased the slider of STRUCTURE to the maximum value 100 to make it clearer

Next, let us check the performance with this hair texture photo.


I set the value at 85.

The hair texture can be clearly seen. Let us compare the photos side by side.

You can see the edges of hair strands clearly so you can see the whole of the photo with good details.

Here is one more example,
FOOD
This time, I will use DEFINITION on iPhone to make this photo clearer.


I set the value of DEFINITION at 75.

If you increase STRUCTURE/DEFINITION, side effects may be seen. Your photo may be noisy or have a high contrast or have a hard image. I increased STRUCTURE more and more. Please see the photos below.


The result has a hard image. The muffin looks hard. The original is a soft image though. You need to fine-tune your photo using this function with a little care.
Anyway, this function is very useful. I will continue to explain how you make your photo clearer. If you would like to learn such functions, just click the #sharpness.