Stands for “Cathode-Ray Tube”, CRT the electron beams inside a check that move across your display either connected or non-connected striking phosphor dost inside glass tube. It’s a kind of computer display or monitor, screen and old technology. Now days they are not in use. They consume more electricity and expensive than liquid crystal display on the basis of colors quality.

Cathode rays were discovered by Johann Hittorf in 1869 in primitive Crookes tubes. He observed that some unknown rays were emitted from the cathode (negative electrode) which could cast shadows on the glowing wall of the tube, indicating the rays were traveling in straight lines.

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Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone.