SEO stands for Search Engine Optimization, it can be anything done to gain organic visibility on any search engines.
As search engines started cataloging the internet in the mid-1990s, site owners began optimizing websites to rank better in search engine results.
SEO Content Tools
In marketing, SEO content tools are pieces of softwares used for keyword research, content writing, on-page SEO optimization, research, and competition analysis. Content writing tools for SEO often use big data, natural language processing, semantics and linguistics to help editorial teams rank higher.
A Complete, Dead-Simple Guide to SEO for Static Site Generators
Search engine optimization