Directory submission services, an in-depth review
During the same period the infrastructure of internet developed and number of users also increased. In order to increase the users traffic on their websites the online websites started to develop their business models. In this era Google also started its search engine marketing program in the years 2000. Danny Sullivan introduced the term 'search engine marketing' in the year 2001 and these services include paid placement, development of online strategies and search engine optimization services. Search engine marketing became the primary money maker tool for the search engines in the statistics of year 2007.