An application form; a document to be filled out and submitted when applying for something (events, programs, services).
奨学金に応募するため、申込書に必要事項を記入した。
I filled in the required items on the application form to apply for the scholarship.
イベント参加には事前に申込書の提出が必要です。
Submitting an application form in advance is required to participate in the event.
申込書は窓口でもオンラインでも提出できます。
You can submit the application form either at the counter or online.