SEO or Search Engine Optimization is a technique or methodology used to increase the visibility of a website or web page in search engines by following specific rules set by them. To get higher ranking in SERPs, users should follow the rules and regulations set by the search engines like Google, Bing, Yahoo, etc. It varies according to the specific algorithm created by each search engines. Most of the times, SEO is implemented by following the Google guidelines due to the major search share of the Google. Around 80%+ searches are made using Google and naturally, the SEO is redefined as optimizing the web pages for Google.
If you have an article about “preventing hair loss,” you simply can’t beat hundreds of other websites that have the same targetted keyword. There might be big sites with a lot of authority and domain age. So, the SEO comes to matter. For a website that follows all the guidelines set by the search engines in the most suitable way, the rankings will be much higher than that of other websites which have slight variations from the perfect SEO. Once you have the 1st or 2nd positions in search results, around 75% of the users who searched the term will likely enter your website.
As per the reports from trusted sources, there are around 200+ various ranking factors which Google take into account when it comes to ranking a website. The specially crafted algorithm will crawl each one of the web pages for a specific keyword, check them for the SEO, and set the SEO impact of that page for the given term. Then, on the SERPs, the web pages will be sorted according to the SEO score that the search engine filtered earlier. The Google Algorithm changes around 300-500 times each year. So, SEO is not a thing which is stable forever.