File that records the activity on a Web server.
Log files yield information such as which files are requested, when files are requested, who requested them, and where they were referred from.
The raw log file information can be helpful if you are looking for specific information, but log file analysis software helps one to quickly and easily view high-level trends. Log analyzers vary greatly in detail and flexibility. Luckily, many companies offer free trial periods so you can determine if the product fits your needs. Some companies even offer their log analyzers as freeware.
How-To Use Google Analytics: The Ultimate Archive of Videos & Podcasts
MarketingTerms.com (March 10, 2012)
Log File Lowdown
University of Texas (June 15, 2001)