With the rapid growth of internet and World Wide Web (www), the world entered into a new information age very complex and very implicit. It revolutionizes the way in which information is gathered, stored, processed, presented, shared and used. Two features of the Web make it a useful and unique platform for computer applications and research: the size and complexity. The sheer size of the web leads to difficulties in the storage, management, efficiency and effective retrieval of Web documents. The complexity of the Web as a distributed information system can be expressed in terms of the connectivity and diversity of web documents, links and usage. These elements present the most important features of complex web system. This paper explores the web from a complex adaptive system (CAS) perspective. It reviews some characteristic behaviours of CAS and shows how the web exhibits similar behaviours. It also proposes two models for organizing the information on the web based on the CAS paradigm