Fiber optics are thin strands of glass or plastic that carry information as pulses of light, instead of using electrical signals like copper cables. They’re widely used for internet, phone, TV, and medical imaging because they can move a lot of data quickly over long distances with low signal loss and strong resistance to electromagnetic interference.

How they work

Light enters the fiber’s core and stays inside because of total internal reflection , which keeps the signal bouncing down the strand until it reaches the other end. A fiber cable can contain one fiber or many fibers bundled together inside a protective jacket.

Why people use them

  • Faster data transmission over long distances.
  • Less signal loss than copper cables.
  • Not affected by electromagnetic interference.
  • Useful in internet networks, telecommunications, and medical tools.

Simple example

Think of fiber optics like a very thin, super-efficient light tunnel: you send light in one end, and information comes out the other end very quickly.

If you want, I can also explain fiber optics vs. Wi‑Fi , or how fiber internet reaches your home.