This is the 7762nd most frequent Japanese word.
可視
"可視" means "visible" or "perceptible to the eye."
The word 可視的 (kashi-teki) is used as an adjective, referring to something being in a state where it can be seen or perceived visually, applied here to data shown in graphs.
データをグラフにして可視的に表現します。
We represent the data visibly using graphs.
The word 可視化 (kashi-ka) refers to making something visible or visualizing a previously invisible entity, such as inner body structures through imaging technology.
この技術により、人体の内部が可視化されます。
Thanks to this technology, the inside of the human body becomes visible.
The word 可視 directly represents the concept of visibility or being observable, used here to describe how the mountain summit is now visible after the fog clears.