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necessary; required
この書類は必要ですか？
Is this document necessary?
必要なものを買ってきてください。
Please buy the necessary items.
Can function as a noun (必要) or adjective (必要な)
Add 'な' when using as an adjective (必要な資料), but omit it when used as a noun (この資料は必要です)
In business or formal writing, '必要' is often used to indicate required documents or procedures
From Middle Chinese '必要' (bit-yew), meaning 'necessary'
Often used in formal contexts and business communication. Can be used as a standalone noun or as an adjective with 'な'