When someone visits a website, their computer or other web-connected device communicates with the website's server. Each page on the web is made up of dozens of distinct files. The site's server transmits each file to user browsers where they are assembled and formed into a cumulative piece with graphics and text. Every file sent represents a single “hit”, so a single page viewing can result in numerous hits.
The importance of search engine optimization is no secret. Many people find websites through search engines these days, and it’s important to make sure your website is optimized for search engine algorithms. Google is probably the most important search engine you should care about, and they are constantly changing the algorithm they use to rank sites.
Web analytics is the measurement of the behavior of visitors to a website. In a commercial context, it especially refers to the measurement of which aspects of the website work towards the business objectives of Internet marketing initiatives; for example, which landing pages encourage people to make a purchase. Notable vendors of web analytics software and services include Google Analytics, IBM Digital Analytics (formerly Coremetrics) and Adobe Omniture.