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SEO (Search Engine Optimization) is the practice of optimizing websites and web pages to rank higher in search engine results for relevant keywords or phrases. The main goal of SEO is to increase the visibility and organic (non-paid) traffic to a website from search engines like Google, Bing, and others.

Here's a more detailed explanation of what SEO is:

SEO involves various techniques and best practices to make a website more search engine-friendly and authoritative, ultimately improving its ranking for specific search queries. These techniques can be broadly categorized into three main areas:

1. On-Page SEO: This refers to optimizing the content and HTML source code of web pages to make them more relevant and easily understandable for search engines. It includes optimizing title tags, meta descriptions, header tags, image alt text, internal linking structure, and ensuring high-quality, keyword-optimized content.[1][3]

2. Off-Page SEO: This involves optimizing a website's authority and credibility by acquiring high-quality backlinks from other reputable websites. Link building through tactics like guest blogging, broken link building, and digital PR are common off-page SEO strategies.[3]

3. Technical SEO: This focuses on optimizing the technical aspects of a website to ensure search engine crawlers can easily access, crawl, and index all the website's content. It includes optimizing site speed, mobile-friendliness, XML sitemaps, robots.txt files, structured data markup, and more.[1][3]

The ultimate goal of SEO is to provide the best possible user experience for searchers by delivering highly relevant and valuable content that matches their search intent.[2] Search engines like Google use complex algorithms to evaluate websites based on hundreds of ranking factors, both on-page and off-page, to determine the most relevant and authoritative results for each query.

Effective SEO involves understanding how search engines work, conducting keyword research, creating optimized content, building a strong backlink profile, and continuously monitoring and adjusting strategies based on algorithm updates and industry best practices.[1][2][3][4]