necessary items; required information; mandatory fields
Refers to things that must be included, filled in, or provided. Common in forms, applications, and procedural contexts.
Please fill in the required fields on the application form.
I'll compile the necessary items before the meeting.
必須項目 is more technical and often used in IT or system contexts for mandatory fields, while 必要事項 is broader and common in everyday forms and procedures.
Compound of 必要 (necessary) and 事項 (matters, items).