The phrase “Millions of people around the world don’t know the secret of this tool” is a clickbait headline. By itself, it doesn’t identify any specific tool, so there’s no factual answer to what the “secret” is.
These headlines are commonly used with photos of everyday items—such as kitchen utensils, can openers, scissors, tape measures, or sewing tools—to encourage clicks by implying there’s a hidden feature.
If you’re referring to a specific tool, please upload the image or describe it. I can then explain:
- What the tool is.
- What its intended purpose is.
- Whether it has any lesser-known features or uses.
- Whether the “secret” is real or simply an exaggerated internet claim.