Online Advertizing According To SEO and WEBANALYTICS

In SEO and Webanalytics terms Online Advertizing is a Campaign Management.Different types of ads includes contexual ads,Rich panel ads,paper ads,banner ads.
Advetiser for example includes Sony,BMW etc,Publisher for example includes Google,Yahoo,Ad Agency for example includes Adzone,Funmark,NDTV,Pixelmedia-asia.com,Mediatwopointzero.com.
Ad Agency acts a intermediate role between Advertiser and Publisher which needs to meet ROI(return on investment).
Ad Serving process includes Publisher and server , Agency and server.
Ad Server types includes :
*24/7 Real Media,
*Zedo,
*Atlas,
*Accipter
*Dobleclick(DART) which is owned by Google,
*Ad Expert,
*OAS(Open Ad Stream)
*Ruby which is owned by Yahoo,
*Ad Tech
Ad Space  & Ad Units
.728*90(Leader Board(LB))
.300*250((Mid Page Unit)or(Message Plus Unit)(MPU))
.160*600(Sky Scrapper)
             They have to be get authorized or registered  or approved  by IAB(Interactive Advertising Bureau) standard.
Online Advertising options
            Online ad networks effectively act as a one step interface between multiple advetisers and publishers.
By using Online Ad Network(which is a collection of websites) we can give ad to all websites at once.