SEO or Search Engine Optimisation is a practice of boosting the quality & number of visitors to the site by enhancing results of rankings in algorithmic search engine.
Research reveals that sites on the very 1st Google page get almost 95 percent of the clicks, & studies also reveal that the results which appear high up on the page get more clicks through the rate (CTR), & more traffic.
There’re also a lot of other listings which could appear in Google search that include map listings, knowledge graph videos, and many more. SEO could include improved visibility in the result sets too.