How to say "broadband" in Japanese

• ＢＢビー・ビー
  nounAn abbreviation for broadband, covering the internet-access sense. It appears in company and service names and casual commercial contexts, but ブロードバンド is normally clearer in ordinary speech and writing.
• ブロードバンド
  nounThe everyday word for broadband in the internet-connection sense — high-speed always-on network access. This is the term you want for talking about home or mobile internet service.
• 広帯域こうたいいき
  nounA technical term covering the broadband or wideband sense, describing signals or equipment with a wide frequency range. It suits engineering and telecommunications contexts rather than everyday talk about internet plans.

For everyday internet-connection talk, 「ブロードバンド」 is the usual choice; ＢＢ is an abbreviated form of the same idea, while 広帯域 is the technical wideband term used in engineering contexts.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• ＢＢビー・ビーbroadband
• ブロードバンドbroadband
• 広帯域こうたいいきbroadband