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Why need pages?
Create website with navigation pages
Multi-page sites makes a lot of sense for users who need traditional navigation to get around. They work very well for giving users a visual map of where to go.For instance, for e-commerce sites, users don’t want to spend a page learning about your company’s story or staff. They want to find the right product, pay you, and move on with their lives. In that case, a nested navigation leading to different pages can be quite effective.
Multi-page sites also give you a better chance to rank for different keywords, since you can optimize for one keyword per page.