Which technology is aimed at improving a website's search engine ranking?

Search engine optimization (SEO) is the technology specifically designed to enhance a website's visibility and ranking in search engine results. By employing various techniques such as keyword research, content optimization, and link building, SEO ensures that a website is more likely to appear higher when users search for relevant keywords or phrases. This process not only increases the quantity of traffic to the website but also improves the quality of that traffic, as users are actively searching for the content or services that the site offers.

Other options like email marketing and email newsletters are effective tools for engaging with existing customers and driving traffic to a website but do not inherently impact search engine rankings. Similarly, social media engagement helps in building brand awareness and may indirectly influence website traffic, yet it does not directly alter a website's search engine ranking through systematic optimization efforts.