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Convergence is the coming together of two different entities, and in the contexts of computing and technology, is the integration of two or more different technologies in a single device or system. A good example is the convergence of communication and imaging technologies on a mobile device designed to make calls and take pictures - two unrelated technologies that converge on a single device.
Convergence is considered a new trend because technological capabilities were only recently established to allow for cheaper and widespread implementation. The simple concept of convergence allows multiple tasks to be performed on a single device, which effectively conserves space and power.
For example, rather than carrying separate devices – like a cell phone, camera and digital organizer – each technology converges on a single device, or smartphone. Another good example is surfing the Internet on a high-definition TV (HDTV).