what is academic report writing

An executive summary provides an overview of the main points of a larger report. It is often written to share with individuals who may not have time to review the entire report. The reader should be able to make a decision based only on reading the executive summary.
An executive summary should summarize the key points of the report. It should restate the purpose of the report, highlight the major points of the report, and describe any results, conclusions, or recommendations from the report. It should include enough information so the reader can understand what is discussed in the full report, without having to read it.

References:

http://www.niu.edu/academic-integrity/faculty/committing/examples/index.shtml