Guide to SEO: promoting your website online
desing page 404
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A 404 error page is displayed automatically when a visitor attempts to access a page that does not exist. Typically, this happens when a visitor enters an incorrect URL or follows an non-existent link (for example, you deleted an old link but it'd been stored in the search index).
We can make page 404 our advantage. For example, you can add contacts and location here to the online representative office of a company, turn Error 404 Not Found into a kind of landing page, posting information about sales and special offers.
Considering the specifics of the resource, invite the visitor to go to the main page, use the search, see the promotions or just entertain him.