What type of informative speech aims to provide a concise overview of a subject?

The focus of an informative speech that aims to provide a concise overview of a subject is best captured by the concept of a brief report. This type of speech is characterized by its succinct and clear delivery of key information, making it ideal for audiences who need a quick understanding of a particular topic without overwhelming details. A brief report is typically structured to highlight the most essential points, ensuring that the audience can grasp the core aspects of the subject matter efficiently.

In contrast, other choices like demonstration speeches are designed to show an audience how to do something, typically involving a detailed explanation and practical steps. Training sessions generally involve longer, more interactive presentations aimed at skill development, while instructional presentations provide comprehensive guidance on a topic. Each of these alternatives focuses on a different approach or goal rather than conciseness and overview, which is the hallmark of a brief report.