Machine thinks in his own way. According to work of search engines, what people search for, the actual search terms or keywords we can type within options of our Internet techniques / equipment and technology / process. SEO is an Internet marketing strategy, and optimizing a website may involve editing its content considerably, and require a lot of patience or adaptations, etc.
More than 90% of all visits come from a search engine (Google and others). Optimizing pages is a long process which optimizes and adapts the content of the pages for searching. The first versions of search algorithms relied on information as the keyword meta-tag or index files in engines. Meta-tags are guides to any content of the page.
There are two types of factors that influence the ranking on Google as the techniques used in optimizing sites: on-site SEO and off-site SEO.
On-site SEO is a part of the optimization that is done on the site: coding, tags, technical elements, organization contents for the site, the elements on the page, the amount of images, texts, videos, their mutual relationship, the frequency of adding content, etc.
Off-site SEO is the part that refers to everything related to your site and not to your server, as links from other sites to your site address, the activity on your official social media accounts, the appearance of the site on the other sites, etc.
We need to register our web-site on Google and/or other search engines, insertions of meta-tags and keywords, making SEO site structure, internal linking, SEO URLs, link building, application sites to the web directories, bookmarking, tracking visitors on Google Analytics (Google's web traffic analytics service), etc.
SEO is a digital marketing technique as the process for achieving better website ranks in search engines. Google is the most dominant search engine in the world, then Yahoo, Bing, Baidu, Yandex, etc.