First step of review process is Screening of a manuscript. In the screening, article will be checked based on the journal policy and from general aspects including:
Article standards(Title, Keywords, Addresses and corresponding author's address, the Structured Abstract, Background, Objectives (optional), Methods, Results, Discussion, References, Acknowledgements)
If all of the above items were OK, manuscript will be sent to next state and indeed it is entered to the review process. Otherwise it will be sent back to author for more corrections and the author has to resubmit it after correcting the errors.