Most often, web developers will use a variety of templates on a site, which may include homepage, category page, product page, content page, search results page, and some resource and ancillary pages, like personalized, brand-specific error pages. Each template can be developed for mobile-friendliness using responsive design techniques and fast loading speeds and have SEO elements integrated into the page. This allows you to reuse templates and immediately have an optimized page without unnecessary delays.