According to optinmonster.com, power words are words that smart copywriters use to trigger a psychological or emotional response. They’re called “power words” because they are so persuasive that people can’t resist clicking.
“Whether you want to entice your visitors to read a blog post, opt into your email list, or click the “Buy Now” button on your sales page, power words are arguably the quickest and easiest way to increase your conversion rates.”