Information technology and internet have created lot of opportunities and challenges for the library professions. Due to information technology most of the libraries are involved in the sharing of the resources by many ways. Library users are widely depend on the electronic resources which are subscribed by libraries in the world. Electronic resources are having lots of features which make it convents to access desire information around the world without any chronological and geographical boundaries. Libraries are involved in the subscription of electronic resources form the various publishers, aggregators, consortia etc. which create complexity in the collection development. The libraries should have the collection development policy for the smooth function of the library which helps in the e-resource collection development. This paper deals with the basic concept of the e-resources, type of e-resource, collection development, collection development policy etc.