To briefly describe this term, which stands for Search Engine Optimization in English, it is a form of on-site and off-site Optimization to increase the ranking of websites in Search Engines.
In-Site Seo In other words, it covers the coding of websites and the arrangement of your website in relation to your business or industry, in accordance with the criteria and standards set by Search Engines for websites.
Off-Site Seo covers promotion and backlink work for your website to be supported by more powerful sites than yours and to send more visitors to your website.
Again, the rules determined by Search Engines cover not only on-site SEO Studies, but also off-site SEO studies.
For example, supporting your website by getting promotions and backlinks from websites that are penalized by Search Engines will do you harm.