Links below site in google search

Question

When I search for some sites like amazon in google , I see the link and description of amazon. Below the main link I also see some smaller links like Books , Music , DVD etc

Answer 1

Those are Google Sitelinks. You can block them by using Google Webmaster Tools, however they are auto-generated, and can only be remove-picked.

After Google Webmaster Tools:

Sitelinks are links to a site's interior pages. Not all sites have sitelinks. Google generates these links automatically, but you can remove sitelinks you don't want. (...) Sitelinks are completely automated, and we show them only if we think they'll be useful to the user. If your site's structure doesn't allow our algorithms to find good sitelinks, or we don't think that the sitelinks are relevant to the user's query, we won't show them. However, we are always working to improve how we find and display sitelinks.

Answer 2

These are generated automatically by Google for popular sites.

You cannot add them yourself, but you can make Google more likely to add them.

For more information, see here.