On-page SEO refers to optimizations made directly on a website, including keyword usage, meta tags, content quality, internal linking, and mobile-friendliness. It ensures search engines understand your site’s relevance and structure. Off-page SEO, however, focuses on external factors like backlinks, social media signals, and brand mentions, which help build website authority and trust. Both are crucial for ranking success. Many eCommerce SEO companies specialize in balancing on-page and off-page strategies to improve online store visibility and conversions.