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Usability
When was the last time you picked up a mobile and read the user documentation? Although mobile phones do come with user guides, most "use" is intuitive and obvious. The user interface of a website can make all the difference between a good and bad experience. This is achieved through a good user interface (UI) design. ... The last thing you want is for people to experience negative emotions and feelings when they visit your website or use your product.
Presentation
Usability Defined
The ease of use and learnability of a human-made object. The object of use can be a software application, website, machine, process, or anything a human interacts with