The robots.txt file is a text file located at the base of your site that is intended to provide instructions to search engine spiders.
It allows, among other things, to :
define one or more links to sitemap files : files that list all the pages of your site
An example of robots.txt file accessible via the url : https://www.tikamoon.com/robots.txt
User-Agent: * Allow: / Disallow: /V2/ Disallow: /recherche Disallow: /articlepopup.php* Disallow: /recommander.php* Disallow: *filtreprix=* Disallow: *action=* Disallow: *artid=* sitemap : https://www.tikamoon.com/sitemap.xml
It is important to have a robots.txt file because, it allows you to clearly define the access rules of your website and, also it is where you fill in its sitemap file. When a part of your site must not be explored for security or uselessness reasons, it is interesting to prohibit the exploration of these pages. Prohibiting exploration does not mean that the pages cannot be indexed (contrary to the "no index" instructions) but it is very unlikely that they will be there. The main interest is that the robots do not waste time (crawl budget) to analyze the content of pages that you don't want in the SERPs.
For example, you have a part of your community site that contains user profile sheets that are poor in terms of content and added value, so it is better to prohibit access to these pages so that the robots mainly explore your pages with added value.
In the absence of this file and generally a HTTP 4xx error during recovery, the robots consider that they are authorized to explore your entire site, which can be a problem as they will eventually explore pages that you did not want them to explore.
If an error occurs during the recovery of this file with an HTTP 5xx error or no response (with a timeout, for example), then they consider that they are not allowed to explore the entirety of your site and you have very little chance that your pages appear on the SERPs.
Similarly, if syntax errors are present in the directives, it is possible that the robots misinterpret your intentions and therefore explore pages that should not be and vice versa.
In order to ensure that the robots.txt file is valid, it is necessary to :
And also, check the syntax of the file by following these few instructions :