What does “noydir,noodp” mean?

Noydir and Noodp is a meta robots tag.
Noodp : It prevents search engine(Google, MSN) to display its own description taken from its directory instead of your meta description. Using this tag search engine will display your written meta description which will improve your CTR
Tag : <meta name="robots" content="noodp " />

Noydir : It is same as Noodp but it will work with only yahoo search engine
Tagv : <meta name="robots" content="noydir" />
 
The noydir and noodp are Meta Robots commands that instruct search engine bots on how to handle the usage of data for your site in the Yahoo! Directory and the Open Directory Project/DMOZ Directory.


The noydir command corresponds to the Yahoo! Directory and the noodp command correlates to DMOZ.

noydir Explained
When a site is listed in the Yahoo! Directory there is a title and description associated with that listing. So, Yahoo! started showing that title and description as the linking text and snippet text in the search engine results page (SERP) whenver that website would show up (most commonly only the homepage). The noydir command overrides this functionality and gives control back to the website owner to control the linking and snippet text in the SERPs via the Title tag and Meta Description tag on their website. By regaining this control you can adjust those fields whenever desired.

noodp Explained
The same functionality goes for the noodp command. However, this is directed at Google. Google partnered with ODP to power the Google Directory so if you website was listed in DMOZ then Google would pull that listing information as the linking and snippet text in the Google SERPs. The noodp overrides that functionality and give you control back.
 
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