What is a backlight in an LED TV?

What is an LED TV? And what is a backlight in an LED TV? We'll also discuss some of the benefits that come with owning an LED TV with a backlight. Click!
What is an LED TV? And what is a backlight in an LED TV? We'll also discuss some of the benefits that come with owning an LED TV with a backlight. Click!

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TV Led Backlight,3.99meter /6.56ftRGB+IC Led TV Light,USB TV Led Strip Lights,114.3-190.5 CmTV/Monitor Behind Lights, Rainbow Color Led TV Light, Home

Technician says all the backlight strips will be replaced even though I watched several videos where only replacing the bad LEDs works too. But they are saying this way the LEDs will

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LED vs QLED vs OLED – What is the difference?

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