This is the 845th most frequent Japanese word.
改善
"改善" means "improvement" or "continuous improvement."
In this context, "改善" acts as a verb-stem, indicating the act of improving something, specifically used with "する" (to do).
プロセスを改善するために、新しい技術を導入しました。
To improve the process, new technology was introduced.
Here, "改善" is combined with the auxiliary verb "しました" to describe an action that resulted in improvement, highlighting the causal relationship.
その提案は仕事環境を大きく改善しました。
The proposal significantly improved the work environment.
Here, "改善" is used as a noun meaning improvement, referring to the process of making something better.