functionality
n. uncountablen. the range of things a computer program, machine, or system is able to do. It describes how well something works and what features it has.
n. the range of operations or tasks that a computer system or device can perform. Often refers to the practical utility or purpose of a design rather than its aesthetic qualities.
The new software update adds extra functionality to the app.
The design team focused on improving the website's functionality to make it easier for customers to check out.
While the interface was visually striking, the lack of basic functionality made the device nearly impossible for the average consumer to operate effectively.
From functional + -ity.
Uncountable when referring to the general quality of being functional; can be countable when referring to specific sets of features in technical contexts.