When someone goes to your site by typing in your URL, the index file is what they normally see first. This prevents viewing other pages or files you may have in the root directory. What your visitor actually sees in this case is your home page. The other directories (sub-folders) on your website, the ones below your root directory, which is typically called "public", or "public_html", do not normally have this index file.
The first method is a simple search with the "site:" operator. This way we can check any domain or page to see if it is included in the search engine's index. The advantage of this method is that we can actually see which pages are included. It is also pretty simple to count all indexed pages, unless the number is not very high. On each page with results Google displays an estimation of the total number of pages that match the search criteria.
Surely it is not the same to getting a permanent index page links. But hey, there is nothing permanent in this world today, even weather changes. However if you do link building reasonably your link building speed is not very quick (otherwise Google can raise red flag on your site and Matt Cutts from Google *leaked* info about it). So with moderate link building speed the link of recently added link partner will stay on your site for 7-10 days.
Your index page - your "splash" page - is your first, and best, chance to convince your visitor to act. The good news is that there is no real size limit to the page - that's one reason you see some very long index pages. Second, your index page is your first opportunity to truly qualify your traffic. If they won't qualify right away, it just means more work and a lower yield to try to get them to act later.
Robots.txt is a simple text file that tells the search engine robots not to crawl certain directories and pages of your site. When a robot crawls your site it looks for the robots.txt file. If it doesn't find one it assumes automatically that it may crawl and index the entire site. Not having a robots.txt file can also create unnecessary 404 errors (page not found error) in your server logs, making it more difficult to track the real 404 errors.
Google set up a crawler-type software, named Googlebot. It is a robot indexing Web pages (and now other types). Its principle is simple (but not its implementation!): when it reads a page, it adds to its list of pages to visit all those linked to the page in the current process. Theoretically, it should thus be able to know the majority of the pages of the Web, i.e. all those which are not orphan (a page is known as orphan if no other links to it).
Figuring out the number of pages that have received at least one visit as a result of Google searches is one of the most important parts of tracking over time, how well the search engine is indexing your site. If you keep track of numbers, checking it once a month or so, you'll get a better idea of how well your pages are doing in terms of attracting traffic.
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