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A monitor or TV with a resolution of 3840 x 2160.

– As broadband speeds rise globally, 4K content is becoming the baseline for new releases, ensuring that today’s purchases remain viewable at the highest quality for years to come. ipzz005 4k link

This refers to a high-definition video resolution of approximately 4,000 pixels horizontally. In most consumer electronics, this standard is 3840 x 2160 pixels, also known as Ultra HD. A monitor or TV with a resolution of 3840 x 2160