“New Media is the whole term for all the media which emerged after the computer and internet which includes Digital and social media. Digital media includes all the digital form of media and communication including internet, CD/DVDs, social media, HardDisk and more. Social Media is the digital media used for social interaction – the internet.” Gopu Palanisamy
Here are the Wikipedia Definitions:
Social media refers to the use of web-based and mobile technologies to turn communication into an interactive dialogue. Andreas Kaplan and Michael Haenlein define social media as “a group of Internet-based applications that build on the ideological and technological foundations of Web 2.0, and that allow the creation and exchange of user-generated content.”[1] Social media are media for social interaction, as a superset beyond social communication.
Digital media is a form of electronic media where data is stored in digital (as opposed to analog) form. It can refer to the technical aspect of storage and transmission (e.g. hard disk drives or computer networking) of information or to the “end product”, such as digital video, augmented reality or digital art.
New media …new media holds out a possibility of on-demand access to content any time, anywhere, on any digital device, as well as interactive user feedback, creative participation and community formation around the media content. Another important promise of new media is the “democratization” of the creation, publishing, distribution and consumption of media content. What distinguishes new media from traditional media is the digitizing of content into bits.Some examples may be the Internet, websites, computer multimedia, computer games, CD-ROMS, and DVDs. New media do not include television programs, feature films, magazines, books, or paper-based publications – unless they contain technologies that enable digital interactivity.[2]