Usability vs. Functionality — What's the Difference?

Usability can be described as the capacity of a system to provide a condition for its users to perform the tasks safely, effectively, and efficiently while enjoying the experience. In software engineering, usability is the degree to which a software can be used by specified consumers to achieve quantified objectives with effectiveness, efficiency, and satisfaction in a quantified context of use.The object of use can be a software application, website, book, tool, machine, process, vehicle, or anything a human interacts with.

The quality of being functional.

Capable of being used

A useful function within a computer application or program.

Fit for use; convenient to use

The capacity of a computer program or application to provide a useful function.

The state or condition of being usable.

(uncountable) The ability to do a task, performance, or execution; a set of functions that something is able or equipped to perform.

The degree to which an object, device, software application, etc. is easy to use with no specific training.

In United States trademark law, the tendency of a product design to serve a function other than identification of the product, preventing that design from being protected as a trademark.

The presence of a functional group.

Capable of serving a purpose well;