"Essentials of Computer Networks, Internet And Database Technologies" delivers a sound knowledge to the readers of the fundamental aspects of Data Communication, Computer Networks, Internet and Database Technologies. This book is an outcome of author's teaching experience at University of Delhi. First three chapters cover the concepts of Data Communications, Computer Networks and Internet Technologies. Clear cut distinction is made between the chapters so that students become able to understand respective concepts properly. Next two chapters cover the topics HTML, JAVASCRIPT and ASP. These are the basic Internet Scripting languages. This can be used to develop Front End of Ecommerce Applications. These are needed to give your website special effects, interactivity and access to the Database. Client side and Server side techniques are discussed with examples and distinction is made appropriately. Last two chapters cover the concepts of Database. We have illustrated theoretical as well as practical aspects (SQL) of databases in detail and with lot of Examples. This book is meant for students pursuing courses in computer science at University level.