Search engine optimization, or SEO for short, is a set of practices that aim to improve the visibility and ranking of web pages in organic search results. Organic search results are the ones that are not influenced by paid advertising, and they are based on the relevance and quality of the web pages.

SEO is important because it can help websites attract more traffic from search engines, which can lead to more conversions, sales, or engagement. SEO can also help websites build trust and authority, as well as provide a better user experience.