This is the 1855th most frequent Spanish word.
explicación
Explanation.
Here, 'explicación' is used as a noun that refers to the act or content of explaining something.
La explicación del profesor fue muy clara.
The teacher's explanation was very clear.
In this sentence, 'explicación' is again used as a noun, denoting a request for the meaning or operational details of the system.
Necesito una explicación sobre cómo funciona este sistema.
I need an explanation about how this system works.
Here, 'explicación' indicates the information provided by someone, emphasizing that the explanation given was insufficient to address the questions.