What is a "bug report"?

A "bug report" is fundamentally a detailed document that outlines a defect or issue identified during the testing phase of a project. It serves as a critical communication tool within the software development and QA process. The primary purpose of a bug report is to provide enough information about the defect so that developers can reproduce it, understand its context, and ultimately fix it.

A well-structured bug report typically includes essential details such as the steps to reproduce the issue, the expected result versus the actual result, environment information (like software version and hardware details), and any relevant screenshots or logs that could assist in diagnosis. This documentation is crucial for maintaining quality in software products and ensuring that issues are addressed efficiently.

The other options don't align with the definition or purpose of a bug report. Completed test cases refer to a record of tests that have been executed without necessarily identifying defects. User feedback is generally broader and not limited to defects, while a list of features to be developed focuses on future improvements rather than current issues. Each of these documents serves different roles within the development lifecycle but does not encapsulate the essence of a bug report.