Sci journals can be divided into oa and non-oa. The articles published in the former are oa articles, while the articles published in the latter are not oa articles.

The publication of SCI journals has become the goal of many researchers. However, many authors find that the popular periodicals in this major are not so easy to publish, and the traditional publishing cycle is also long, so some authors find another way to publish OA periodicals.

OA is also a periodical. There are many OA journals in SCI journals, but not all OA journals are SCI journals. Some authors are biased against OA journals. OA journals are actually electronic journals. The reason for prejudice is probably that electronic journals may not be recognized. The following is a detailed introduction of OA journals.

OA periodical is an action that international academic circles, publishing circles and library and information circles use the Internet to promote the free dissemination of scientific research results, and it is a substitute for the traditional subscription-based publishing model. In this way, anyone can get all kinds of documents in time, free of charge and without any restrictions through the network.