SEO (Search Engine Optimization) improves a website’s visibility on search engines like Google, increasing organic traffic. It involves on-page SEO (keyword optimization, quality content, meta tags), off-page SEO (backlinks, social signals), and technical SEO (site speed, mobile-friendliness, structured data). Local SEO helps businesses rank for location-based searches. Search engines use algorithms to rank websites based on relevance, authority, and user experience. Regular updates, quality content, and ethical SEO practices (white-hat SEO) are essential for long-term success. Avoid black-hat tactics like keyword stuffing, which can lead to penalties. SEO is a continuous process requiring analysis and adaptation to algorithm changes.