From the point of view of the user of the UI: because I can read and interact with the application on different laptops, PCs, tablets and smartphones, and all I need is one ubiquitous kind of application (i.e. a web browser) and my login credentials.
From the point of view of the creator of the UI: because I can create an application that people can read and interact with on different laptops, PCs, tablets and smartphones, without me needing to make and maintain separate applications for all those types of hardware.
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From the point of view of the user of the UI: because I can read and interact with the application on different laptops, PCs, tablets and smartphones, and all I need is one ubiquitous kind of application (i.e. a web browser) and my login credentials.
From the point of view of the creator of the UI: because I can create an application that people can read and interact with on different laptops, PCs, tablets and smartphones, without me needing to make and maintain separate applications for all those types of hardware.