Researchers record the results of their work in academic articles. The aim of these articles is to inform other researchers about research findings and to lay claim to the findings as new and original insights. Such claims are not usually acknowledged by other researchers until the article has been published in a peer-reviewed journal.
What is peer review? Peer review is a form of quality assessment. In this context, the word ‘peer’ (meaning an equal) refers to a fellow researcher. A peer review is therefore an assessment by a fellow specialist in the relevant field. Peer reviewers assess whether an article meets certain requirements, such as originality, accessibility and solid substantiation of the results. All academic journals work with a system like this in order to assure the quality of the articles they publish.
If an article is peer-reviewed, you can assume that the information is reliable and of the required standard. In many bibliographic databases you can search specifically for peer-reviewed articles.