What is Autotrace and what is used for?

This is a tutorial for autotrace, you can found it in any SolidWorks versions
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Step 1:
Well, we start with this picture found on internet
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Step 2:
Then we activate the add-in, we click "tools - add-ins" and select "autotrace"
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Step 3:
Then we open a new sketch and insert the picture using "tools - sketch tools - sketch picture"
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Step 4:
When we insert the image, in the options panel, appears some arrows to follow autotrace steps
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Step 5:
When we click next, we have some tools for image treatment, like area selection, show a preview, show trace geometry, adjust luminosity, image contrast, color tolerance and recognition tolerance, this are useful to filter the lines we want for our sketch
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Step 6:
Then select the area to begin the new trace
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Step 7:
Finally we see that the trace are automatically generated
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Step 8:
Just click accept to have the new sketch geometry
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Step 9:
Even is a automatic tool is not perfect, this depends on picture quality, contrast, size, and other factors