The impotance of Deep link

Deep linking is an important aspect of digital marketing. It doesn’t matter which link brought the visitors to our website as long as they have actually reached the homepage. Once they are here, we can convince them to buy or services. Deep links are very important since the search engines might consider our website authorized as it is back linked many times. Hence ultimately our website will be ranked among the top engine searches.
Deep links actually point towards your website and is an important tool for digital marketing. However it is important to take into consideration that which websites are deep linked. If only the homepage is deep linked then it is of no use when all the articles and important information is on some other page.
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Quite simply, a deep link is a link pointing to a page on your website that isn't your home page. For example, if you have an e-commerce website selling tools, and you have a specific page listing hammers, a link from another website pointing to this specific page about hammers (e.g. yoursite.com/hammers.html) is a deep link.

Deep links give "link juice" DIRECTLY to the page they are linking to, so this is a good way to get a number of your web pages to rank well in the search engines

Deep links give your site a far more natural "link profile" to search engines. If you ONLY had links to your home page, it's not so natural because people like to link to interesting content - so they're more likely to link to a specific page than the home page of the website (where the users would then have to navigate to find the interesting content if it's not on the home page already). A hundred links to your home page and zero links to any other pages on your website isn't natural.

What is digital marketing???? I never hear about deep link for any use.....