What do you call the filename that tells search engines whether they can access and therefore crawl parts of your site?

Which will not prevent content from appearing in search results?

What is the difference between exit rate and bounce rate? 

_________________ is the practice to sell a blog when it becomes famous and popular as well as driving a healthy amount of traffic.

What is keyword density and what is the formula for it?

What will be the effect of the entry in your website's robots.txt file? User-agent: googlebot Disallow: User-agent: * Disallow: /

From a purely ranking perspective, the value of an incoming link is not affected by the number of outgoing links on the same Web page.

Which statement is true regarding natural vs. artificial inbound links?

What do you enter in a robots.txt file to block a specific directory and everything in it?

In the robots.txt file, what does the 'Disallow:' line do?

What do you enter in a robots.txt file single entry to apply the rule to all bots?