Meaning of custom robot header tags

1. all- This command says the search engines that there are no restrictions for indexing or serving.
2. noindex- When this command is turned on in a particular page, the page will not appear in search results.
3. nofollow – If this command is turned on the search engines will not follow the links present in a page.
4. none- This command is equivalent to noindex & nofollow. If you neither want to index a page nor follow any link present in the page then you can use this command.
5. noarchive- Use of this command in a page will not show a “Cached” link in search results of that particular page.
6. nosnippet- This will not show a snippet in the search results for the page.
7. noodp- This command will not use metadata from the Open Direcrory project for titles or snippets shown on the page.
8. notranslate- If you use this command, search engines will not offer translation for the page in search results.
9. noimageindex- It doesn’t index images present on a page.
10. unavailable_after- Using this command will help you to stop search engines from displaying a page in search results after a certain period.