Web Analytics
Web analytics refers to studying online behavior in order to establish improvements. These are classified in two categories:

Web Analysis
A. Off-site Web Analytics
This is the web measurement and analysis irrespective of whether you do maintenance or own a website. Also, this type of analysis includes measurements of a website’s opportunity, visibility, and comments that are on going on the internet as a whole.
B. On-site Web Analytics
This analyzes and measures the performance of your website in commercial aspect which is usually compared to important performance indicators for performance. This then is used to improve a web site or marketing campaign’s audience response
Web Analytics was initially referred to on-site visitor measurement. However, in the recent years, this has become hazy due to vendors producing tools that span both categories
Many companies offer on-site web analytics software and services. There are two main approaches in collecting the data that have been developed. The logfile analysis which, reads the logfiles that are recorded by the web server and the page tagging, which utilizes JavaScript on all pages to inform third-party servers when a page is rendered by a web browser. These two methods gather data and can be processed in to web traffic reports.
In addition to this, there are many other sources that may be used to augment the data like e-mails response rates, direct mail campaign data, sales and lead information, user performance, and other metrics that are needed.