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In this course, author David Booth explains what search engine optimization (SEO) is and how you can start using it to increase your website's visibility to search engines and attract the right kind of traffic to the right kinds of pages on your site. Discover how to read a results page and find your ranking, and see how rankings affect both large and small businesses. Then find out how to implement basic optimization strategies, like conducting keyword research, building inbound links, optimizing your pages and content, and measuring your successes and progress while planning for a long-term SEO strategy. SEO for ecommerce, local search, and an international audience round out this comprehensive look at the basics of SEO.
As search engines try to find and index all the pages that they find on the Internet, they rely on unique URLs as pointers to each piece of content. While there should be a single, unique URL for each page on the Internet, often our web pages can introduce slightly varied URLs for the same piece of content, resulting in duplicate URLs in the search engine's index. A common reason for this is the use of URL parameters. These are extra bits of data that are appended to the end of URLs, and they can be used to do a variety of different things.
Sometimes they can actually control what content shows up on the page, and in those cases, the different URLs actually are different pages. Other times though, they have nothing to do with the content. They could be used for storing session IDs or tracking parameters, and while the URL may be different, the content is unaffected. The problem is, search engines can't assume which are important URL parameters for content, and which are not. One way to resolve this issue on your site is to use the rel="canonical" meta tag.
This tag is something that you add to your page that acts as an instruction for search engines. It tells them that no matter what URL might be showing up in the address bar, make sure to index this URL as the primary URL for this content. Another way to clear up any confusion about how your site uses URL parameters is to tell the search engines directly through Google Webmaster Tools and Bing Webmaster Tools. Here, you can instruct search engines on whether or not they can ignore certain URL parameters.
Another reason that duplicate content may exist is because content may have been moved from one location to another on your site. The old location and the new location could potentially be in the search engine's index at the same time. And to avoid this situation, whenever you move content around, it's important to implement redirect rules. There are a few redirect types that you or your webmaster can use, but let's take a look at two in particular. The first is known as a 302, or temporary, redirect.
This should only be used for short-term content moves, like when you want to show an alternate page while your site's down for maintenance. It tells the search engine that the page it's looking for isn't there now, but will be back very shortly. So, please don't do anything to your index. For long-term or permanent content moves, which search engines are really concerned with, you will want to use a 301 or a permanent redirect. These redirects tell a search engine that although they may have indexed a previous URL for that content, the old URL is no good anymore.
The search engine should take everything it knew about the old URL and apply it to the new one where that content now lives. Ensuring that the search engines know which URLs your pages live, on and that you have unique URLs for each of them, will help search engines index your pages properly, and this is a building block on the path to the top of the search results.
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