System: Windows 10

PMID is the contribution number of life science and medicine included in PubMed search engine. Doi is an international digital object identification number foundation, a non-profit organization established in 1998.

The use of PMID is similar to the International Standard Book Number (ISBN) and DOI, and it can be directly used in PubMed search engine. Each PMID number corresponds to a unique document, and readers can check the title, author, abstract and other information of the document for free.

PubMed is a free search engine that provides a database of biomedical papers and abstracts. Its database source is MEDLINE. Its core theme is medicine, but it also includes other fields related to medicine, such as nursing or other health disciplines. It also provides quite comprehensive related biomedical information resources such as biochemistry and cell biology. This search engine is provided by the National Library of Medicine and is a part of Entrez information retrieval system. PubMed information does not include the full text of journal articles, but may provide links to full-text providers.