What Is Usability Testing?
Usability testing is a technique used in user-centered interaction design to evaluate a product by testing it on users. This can be seen as an irreplaceable usability practice, since it gives direct input on how real users use the system. This is in contrast with usability inspection methods where experts use different methods to evaluate a user interface without involving users. {Source: WikiPedia}
These 3 infographics will give deep insights of Responsive Design, UX & CX etc.
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