SEO stands for Search Engine Optimization. It’s the process of improving your website in order for it to appear on search engines such as Google and Bing when people search online.
This is an organic marketing strategy, meaning that you aren’t paying for an ad to show up on the Search Engine Results Page (SERP), but rather using optimization techniques to have your site rank without paying for it (well, without paying search engines—you might pay for an SEO expert or SEO tools to help). That’s the basic concept. There are several types of SEO that you’ll want to be aware of, including: technical SEO, local SEO, mobile SEO, and on-page SEO.