An error log is a listing of the error messages and warnings which displayed for one reason or another while your visitors were surfing around your website. This kind of a log features raw info on the way the server has dealt with requests in different situations. An error message could appear if, for instance, a link leads to a website or a file that's not on the server, if the code on a given page can't be processed, if any individual is trying to access the website or its back office via an IP address which is blocked by an .htaccess rule etc. The info within the error log offers the IP address of the visitor, what error message appeared and the basis for the hosting server to show it, the full path to the file which caused the error and the precise time of the event. Having this info will permit you to learn if any part of your Internet site has an issue, that you can then resolve. Therefore, your website visitors will have a better experience and you'll optimize the site for optimum performance.