[MzxgckZtNqX5i]

"Articles" on arXiv are not peer-reviewed, they just check whether it looks like it belongs to one of the categories they hosts:

"Registered users may submit articles to be announced by arXiv. There are no fees or costs for article submission. Submissions to arXiv are subject to a moderation process that classifies material as topical to the subject area and checks for scholarly value. Material is not peer-reviewed by arXiv - the contents of arXiv submissions are wholly the responsibility of the submitter and are presented “as is” without any warranty or guarantee." [0]

They are commonly known as pre-prints, in a similar fashion to IACR ePrint [1] for cryptography.

[0]: https://info.arxiv.org/about/index.html

[1]: https://eprint.iacr.org/