usability
//ˌjuːzəˈbɪləti//
Noun
usabilitySingular
1
The degree to which something, especially a product, system, or interface, can be used easily and effectively by its intended users.
The team conducted usability testing to improve the app's design.
2
The quality of being user-friendly and accessible in design.
The usability of this app makes it popular among elderly users.