It is the process of improving a website so it appears higher in search results when people look for something related to it.
It's like telling Google, "Hey, my site has the best answer for this question." For example, if you run a bakery and someone searches "best chocolate cake near me," SEO helps your bakery's website show up at the top.
It includes things like using the right keywords, writing helpful content, optimizing titles and images, and building from other trusted sites. Over time, good SEO brings more organic visitors without paying for ads - it just takes consistency and patience.