Ergonomics to holistic usability experience
40 years ago, if you asked many designers about their products' usability, they would probably talk about function and ergonomics.
Usability has since evolved to include all facets of space between people and things. This includes consideration of senses, cognition and feelings.
At its core, Human-Centered Design focuses on understanding this space, moving beyond functionality and physical elements to evoke intended emotions and foster trust.