What is robot. txt. and keyword density?

Robots.txt - Robots.txt file is a text file for restricting bots (robots, search engine crawlers ) from a website or certain pages on the website. Using a robots.txt file and with a disallow direction, we can restrict bots or search engine crawling program from websites and or from certain folders and files.

Keyword density - Keyword density is defined as the number of times the keyword repeats throughout the article. It is expressed as a percentage to the total number of words in the article.

Formula for “Keyword Density” = (Number of times the keyword repeats in the article / Total number of words in the article)*100
 
The robots.txt is a simple text file in your web site that informs search engine bots how to crawl and index website or web pages. It is great when search engines frequently visit your site and index your content but often there are cases when indexing parts of your online content is not what you want.
 
Robots.txt :- Robots.txt is a text file where you can write the instruction for search engine that how it behave on website. Like if you don't want to crawl some pages then you can mention on there then google will never crawl and index that page and it will never to in to live.
Keyword density :- How many time repeating you single word on you hole article that is major by repeating words /all words *100. 3% keyword density is slandered which is approved by google. If you keyword density is more then 3% then google will give low priority on that particulate word.
 
Robot .txt is a program file that allows crawlers to crawl on specific pages of the website.

keyword density is a completely different thing, it determines the amount of keyword on the page. Usually, it is ideal to have about 2-3% of keywords on a single page, more than that would be known as keyword stuffing which is not desirable.
 
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