MeSH is the acronym for Medical Subject Headings, the U.S. National Library of Medicine's controlled vocabulary used for indexing articles for MEDLINE/PubMed.
MeSH Terms are particularly powerful search tools. They are added to the PubMed information about the article by trained indexers at the National Library Medicine. Using the correct MeSH Term can help you find all the articles on your subject.
Request to meet with a librarian to learn more about using MeSH to improve your PubMed search results.