How can I stop my Mac's screen from doing this?

How can I stop my screen from like dim, when i'm watching a video or reading something it dims and i have to move the mouse.
How can i stop this?

Carolyn Samit wrote:
Look on your keyboard, the top row of keys. First you see "esc" ... then directly next to the right are F1 and F2. They should have asterisk icons, one smaller, one larger. You can use those to brighten or dim the display.
And you can set the Brightness in System Preferences/Displays using the slider.
These controls only set the upper limit of brightness. They don't prevent the screen from dimming automatically. The Energy Saver setting will probably take care of the posted problem.

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