WordPress plugins are small software programs that add specific functionality to a WordPress website. They can be easily installed and activated from the WordPress plugin repository or by uploading them to the website. There are thousands of WordPress plugins available, which can be used to add features such as contact forms, social media integration, and e-commerce functionality. They allow users to add additional features to their site without requiring any coding knowledge. Once activated, plugins are typically integrated into the website and can be configured through the WordPress administration panel. Some examples of popular WordPress plugins include Yoast SEO, WooCommerce, and Akismet.