user-friendly
adjective
uk/ˌjuːzəˈfrendli/ useasy for people to use:
user-friendly design/feature/interface The notebook's user-friendly features allow fast and simple document conversion.
The company's high-tech tools help manufacturers make their appliances more user-friendly for consumers.
user-friendliness
noun [ U ] uk/ˌjuːzəˈfrendlɪnəs/ us/-zɚ-/
The focus of your website should be on user-friendliness.