Answer:
Topic
Step-by-step explanation:
This is a topic because when it is the theme usually explains the background information such as when or where is happened, It is considered a topic because it serves as the subject or main idea of the information that follows. As a topic, it provides the reader or listener with an initial focus or point of reference for the information that will be presented. In this case, the topic is "Explanation," and the information that follows explains what a topic is and why it is important. By establishing a clear topic, the writer or speaker can more effectively convey their message and help the audience to understand the information being presented.