I can explain the concept of search engine optimization in simpler words than you can read on Wikipedia. Search engine optimization is about moving certain sites higher on the search pages. For example, you have a site related to children's toys from Toronto. When you type "Toys Shop in Toronto" into your search, that site is on the second page of Google's search. But thanks to SEO, that site can become the first link on the first page of Google, you know. I didn't know about all this before until I needed to optimize my website. I found a seo checker free that did a detailed analysis of all my website errors. Thanks to this, I made the site much cooler and more modern.