Which of the following is an important factor for optimizing a website for SEO?

Optimizing a website for SEO involves various strategies, but keyword usage and quality content are critical components. Keywords are terms and phrases that users enter into search engines, and incorporating these strategically within a website helps search engines understand the content and relevance of the site to user queries. High-quality content, on the other hand, not only engages readers but also encourages them to spend more time on the site, which can enhance the site's authority and improve its rankings in search results.

When a website effectively utilizes relevant keywords while providing valuable and informative content, it can attract both search engine crawlers and users, increasing the likelihood of higher visibility and better performance in search engine results pages (SERPs). This combination plays a vital role in creating a strong SEO foundation.

The other options, while important in the overall digital marketing strategy, do not directly align with the primary focus of optimizing a website for search engines. For instance, website design can impact user experience and mobile responsiveness, but it is not sufficient on its own for SEO. Similarly, email marketing tactics and social media engagement are critical for promoting and distributing content but do not fundamentally change how a website is optimized for search engines.