Systematic reviews are often published in scholarly journals and the Cochrane Database of Systematic Reviews. They are a particular type of literature review that attempts to answer specific research questions by identifying, critically assessing, and synthesizing all the research studies that meet pre-specified eligibility criteria.
The key characteristics of a systematic review are:
(Source: Higgins, J., & Green, S. (Eds.). (2011). Cochrane handbook for systematic reviews of interventions (version 5.1). Retrieved from http://handbook-5-1.cochrane.org)
Meta-analysis is a research method that systematically combines information from a number of research studies to draw one or more conclusions from the body of available evidence. Meta-analysis is most useful in addressing questions for which a substantial body of high-quality research already exists, because the quality of the conclusions drawn by a meta-analysis depends in large part on the quality of the studies included. Meta-analysis can be particularly useful when studies have produced inconsistent or conflicting results. As the number of published research studies on a particular topic increases, meta-analysis is an important tool to help make sense of the available evidence.
(Source: Boslaugh, S. E. . M. (2019). Meta-analysis. Salem Press Encyclopedia.)