Search Engine Optimization (SEO) is a digital marketing strategy and practice focused on increasing the visibility and organic (non-paid) ranking of a website or webpage on search engine results pages (SERPs). The goal of SEO is to attract more relevant and organic traffic to a website, ultimately leading to improved brand visibility, higher conversion rates, and increased revenue.

SEO involves various techniques and best practices to optimize a website so that search engines, like Google, Bing, or Yahoo, can easily understand its content and purpose. Some key components of SEO include:

1. **Keyword Research:** Identifying and targeting relevant keywords and phrases that users might use to search for products, services, or information related to the website's content.

2. **On-Page SEO:** Optimizing the content, title tags, meta descriptions, headings, and URL structure of web pages to align with target keywords and improve search engine crawlability and relevancy.

3. **Off-Page SEO:** Building high-quality backlinks from other reputable websites to improve the website's authority and trustworthiness in the eyes of search engines.

4. **Technical SEO:** Ensuring that the website's technical aspects, such as site speed, mobile-friendliness, crawlability, and structured data, are optimized for search engines.

5. **Content Creation:** Producing high-quality, valuable, and relevant content that addresses users' search intent and answers their queries effectively.

6. **User Experience (UX):** Enhancing the overall user experience on the website, making it easy for visitors to navigate, find information, and engage with the content.

7. **Local SEO:** Optimizing a website to appear in local search results for location-based queries, particularly important for businesses serving specific geographic areas.

8. **Social Media Integration:** Utilizing social media platforms to promote content, engage with the audience, and increase brand visibility, which can indirectly impact SEO.

SEO is an ongoing process, as search engines continually update their algorithms to deliver the best and most relevant results to users. It requires regular monitoring, analysis, and adjustments to maintain or improve a website's search engine rankings.