Technical Definition
Service workers are JavaScript files enabling offline functionality, caching, and background sync for web apps. SEO considerations: ensure content is still crawlable, avoid caching issues preventing fresh content discovery. Properly implemented, don't affect SEO. Part of PWA functionality.
Simple Explanation (ELI13)
Service workers are scripts that let websites work offline and cache content. For SEO, make sure they don't accidentally hide content from Google or serve outdated cached versions. When done right, they don't hurt SEO and make your site faster.
Related Terms
PWA, Caching, JavaScript, Performance
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