What is NOODP and NOYDIR in SEO?

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NOODP Explained
Lets talk about NOODP first. According to Matt Cutts blog, in some cases, if someone types in a keyword into the search, Google may use descriptions from the open directory project as the page title and meta description for you organic listing. The NOODP tag allows you to essentially opt out of the open directory project title and description override. Just in case you werent aware, the open directory project is DMOZ. Matt mentions that it may take 3 to 4 days for your NOODP meta tag to update after your page was re-crawled.


NOYDIR Explained
Now, the NOYDIR meta tag is specifically used to prevent the search engines from displaying your Yahoo! Directory page title and meta description. This is used for all of the same reasons mentioned above, only its for Yahoo!. Joshuabelland.com says that Yahoo!s spider slurp is the only spider that will use the Yahoo! Directory page title and meta description.
Jun 1st 2018 04:01 1 Likes  

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I don't know about this. Can you elaborate?
Jun 1st 2018 05:32   

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I have hundreds or URLs for real estate listings on my site that simply use "Index", Follow" without using Noodp and Noydir. Should the listing pages use these Noodp and Noydr also? All major landing pages use Index, Follow, Noodp, Noydir. Is this the best setting in terms of ranking and SEO.
Jun 1st 2018 07:05