Yahoo is acquiring the video advertising platform BrightRoll for $640 million, in a move that could help to offset declines in its traditional display ad business.

The deal was announced Tuesday and is one of Yahoo’s largest acquisitions since it bought Tumblr last year for just over $1 billion.

Yahoo already runs video ads on properties like Yahoo Screen, but BrightRoll’s system gives marketers a way to buy ads in real time across thousands of websites and mobile apps.

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