The process is very simple, article rewriter tool will scan through the given content for the words that it can replace with a synonym. If article spinner will come across a word that it can replace with a substitute then it is switched with one of the suitable substitutes and is highlighted, making it easier for you to identify. However, you can click the word if you want to revert to the original text, find a different suggestion or add your own text.
For this purpose, humans have created numerous rewriting tools to save time and use all words available in the English dictionary. Rewriting tools use millions of synonyms made available to them through artificial intelligence and instructions given by the human mind. If you hire the services of a content writer to rewrite/create content for you, they will charge you a lot. Big organizations can afford this but small startups and students can never afford the services of professional writers.    
This time, WordAI calculates the spin it generated at 97% uniqueness which is basically completely unique. If you look at the text above, again, the first sentence of the quoted content is a bit confusing, but the rest is still good. I would even say that the last sentence came out better than the previous spin, but generally, yes, the above spin looks more like a human wrote it.
Having struggled flat broke for 4 years in IM before I made it, I know better than anyone what it's like to never see success. I know what it's like to keep failing over and over when it seems like everyone else is succeeding online. The good thing is that I never gave up, so here I am, who know how to make money online wanting to help you achieve what I did... MUCH faster than I did. Hey it's Leo. I'm a sort of an optimist. Survived internet marketing, wonderful wife, have 2 kids. My wife would say I'm a night... I think morning. Enjoy travel, spend times with friends. Go out to parks, fishing and watching football and trees (treekeeper) are the things that I love to do.