The requirements for reading the article completely vary greatly. Many domestic periodicals still use mail. In order to edit charts easily, WORD format is generally needed. Even if some journals are uploaded online, they are mainly delivered by WORD, which is convenient for reviewers to modify on the one hand and editors to modify on the other. WORD was also recommended by many international journals when it was uploaded. Some journals also support LATEX or other formats and use PDF journals directly. Personally, I have never seen them. General websites will generate PDF files according to the content you upload.