Web 2.0 

Web2.0 is a second generation of web . It was defined by Dale Dougherty in 2004 as a read-write web. The concept began with a conference brainstorming session between O' Reilly and media  live International. The technologies of web2.0 allow assembling and managing large global crowds with common interests in social interactions.

Tim O' Reilly defines web2.0 on his website as follows:-

"Web2.0 is the business revolution in the computer industry caused by the  move to the internet  as platform , and an attempt to understand the rules for success on that new platform , an attempt to understand the rules is this. Build applications that harness network effects to get better the more people use them."

Web2.0 facilities major properties like participatory, collaborative, and distributed practices which enable formal and in formal spheres of daily activities on going on web. In other terms it resemble major distinct characteristics of Web2.0 include "relationship" technologies, participatory media and a social digital technology which in term can also defined as the wisdom web. People-centric web and participative web is taken in to concern and which facilities reading and writing on the web which makes the web transaction bi-directional.

Web2.0 is a web platform where users can leave many of the controls they have used in web2.0 In other words; the user of web2.0 has more interaction with less control. Web2.0 is not only a new version of Web 1.0 bit it also implies to flexible web design, creative reuse, updates, collaborative content creation and modification in web2.0 that should be considered as one of the outstanding feature of the web 2.0 is to support collaboration and to help gather collective intelligence rather web 1.0.

Characteristics of web 2.0

Web2.0 is instead a label coined by Tim O' Reilly and associates to reference the transition of World Wide Web to a new phase of use and service development. The categorization can be used to elaborate on the understanding of Web2.0 achieved through varied definitions.

• Technology Centric Characteristics:
  Web has become a platform with software above the level of a single device.
  Technology that is associated with blogs wikis, podcasts, RSS feeds etc.
• Business Centric Characteristics:
  It is a way of architecting software and businesses. The Business revolution in the computer industry is caused by the move to internet as platform and an attempt to understand the rules for success on that of new platform.
• User Centric Characteristics:
  The Social Web is often used to characterize sites that consist of communities. It is all about content management and new ways of communication and interaction between users. Web application is facilities collective knowledge production, social networking and increase user to user information exchanges.

Limitation of Web 2.0

Sometimes it may happen that if the new technology meets expectations of the mass user at  large, there may be a chance that these technologies may face lot of consequences from external environment which may suppress or limit the flow of technology as a whole.

• Constant Iteration Cycle of change and updates services.
• Ethical issues concerning build and usage of web2.0
• Interconnectivity and knowledge sharing between platforms across community boundaries are still limited.