A WordPress SEO plugin is a tool you install on your WordPress site to handle SEO tasks that would otherwise require manual coding or developer work. These plugins provide interfaces to control title tags, meta descriptions, canonical URLs, XML sitemaps, robots.txt directives, and structured data markup. They're essential because WordPress out of the box has limited SEO functionality. The three dominant plugins are Yoast SEO (40+ million installs), Rank Math (2+ million installs), and All in One SEO Pack (3+ million installs). Yoast is the oldest and most conservative, Rank Math offers more features in the free version including schema templates and local SEO modules, and AIOSEO sits somewhere in between. For e-commerce sites running WooCommerce, all three have product-specific features like automatic product schema and breadcrumb management. Key features you actually use daily include meta tag templates with dynamic variables, XML sitemap generation with category exclusions, schema markup builders for products and reviews, redirect managers for handling deleted products, and OpenGraph tags for social sharing. The content analysis features that score your writing are mostly noise—ignore the traffic light ratings and focus on the technical controls. At Ottawa SEO Inc., we typically run Rank Math on client e-commerce sites because the free version includes WooCommerce schema and local business markup without upsells, and the redirect manager handles the constant product URL changes that happen in online retail. We disable the content scoring sidebar entirely because it encourages keyword stuffing and doesn't correlate with actual rankings. The main trap is over-reliance. A plugin can't fix thin content, slow hosting, or poor site architecture. It handles metadata and technical signals, but you still need proper keyword research, quality product descriptions, and a logical category structure. We've seen stores with perfect Yoast scores get zero traffic because they optimized the wrong pages for the wrong keywords. Use the plugin for infrastructure, not strategy.