An error log is a list of the error messages and warnings which displayed for one reason or another while your visitors were surfing around your site. This kind of a log includes raw info about the way the hosting server has dealt with requests in various situations. An error message may appear if, for example, a link leads to a page or a file that's not on the web server, if the code on a certain page cannot be processed, if someone is trying to access the Internet site or its back office using an IP address which is blocked by an .htaccess rule and so forth. The data within the error log features the IP address of the site visitor, what error message appeared and the basis for the web server to display it, the full path to the file which caused the error and the exact time of the event. Having this data will enable you to find out if any part of your Internet site has an issue, which you can then clear up. For that reason, your site visitors will have a better experience and you'll optimize the Internet site for optimum performance.