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Multimedia is a form of communication that uses a combination of different content forms such as text, audio, images, animations, or video into a single interactive presentation, in contrast to traditional mass media, such as printed material or audio recordings, which features little to no interaction between users.
Multimedia principle: Deeper learning is observed when words and relevant graphics are both presented than when words are presented alone (also called the multimedia effect).  Simply put, the three most common elements in multimedia presentations are relevant graphics, audio narration, and explanatory text.
Educational technology (commonly abbreviated as edutech, or edtech) is the combined use of computer hardware, software, and educational theory and practice to facilitate learning.   When referred to with its abbreviation, edtech, it often refers to the industry of companies that create educational technology.
Social media in education is the practice of using social media platforms or technology to enhance the education of students. Social media is defined 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 ". 
Media ecology theory is the study of media, technology, and communication and how they affect human environments.  The theoretical concepts were proposed by Marshall McLuhan in 1964,  while the term media ecology was first formally introduced by Neil Postman in 1968. 
An over-the-top ( OTT) media service is a media service offered directly to viewers via the Internet. OTT bypasses cable, broadcast, and satellite television platforms: the types of companies that have traditionally acted as controllers or distributors of such content. 
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