SEO i.e. Search Engine Optimization is, simply put, attracting traffic from the search results on various search engines. These search results are free or organic as opposed to paid searches (ads). SEO basically attempts to improve your ranking on various search engines.
So, what exactly do search engines consider while increasing your rank?
In a nutshell, search engines place those search results first which appear to be more relevant than the others in terms of the information they have to offer. More importantly, search engines rank authoritative pages higher than other. Authority of a page is nothing but the number and quality of links that other web pages use to link to the said page.
So, what can one do to create authoritative and relevant pages?
Nothing works better than quality content. Creating content that is useful and relevant for readers ensures that it is shared on various platforms, thus increasing its “authority”. Search engines eventually recognize this and promotes these pages higher up their rankings. The more interesting and relevant you make your pages, the better they will rank.