This is the 745th most frequent Japanese word.
解説
Explanation; commentary; interpretation.
Here, 解説 is used to mean an explanation or comment, referring to a detailed and clarifying description.
彼の解説はとても分かりやすかった。
His explanation was very easy to understand.
解説 refers to explanations that are included to provide understanding, often supplemented with visuals.
この本には図を使った解説が含まれています。
This book includes explanations using diagrams.
In this context, 解説 is associated with a commentator, implying commentary or narrative explanation given during an event.