Impact metrics are just that, a measurement of content's impact on a discipline and the broader community. Students may access these metrics through the library databases and freely accessible applications on the open web. All impact metrics have strengths and limitations in both design and output.
Impact metrics can help you develop a perspective on your research output and the research impact of fellow scholars. They can reveal the importance of a body of research and the impact of an individual scholar and highlight a work's positive and negative impressions.
Impact metrics are not an assessment of the quality of a work, they reflect the impact based on usage of a specific work on a field of study, a topic or a discipline.