Before digital technology, communication relied on physical movement by sending letters or even using pigeons, which could take days or months. The invention of the telegraph changed this by allowing messages to be sent instantly using electrical signals, like Morse code beeps. This was an early example of digitization, where information is broken into simple, discrete signals. Sound works similarly in the real world, sound is a continuous pressure wave, but when digitized, it gets converted into fixed values that can be stored and transmitted efficiently. The key advantage of digitization is that it reduces the impact of noise. In analog systems like early telephones, signals weaken over distance and pick up interference, making it hard to separate the original message from distortion. Digital systems simplify the signal into clear units, so even if noise is present, the message can still be understood. This is why modern communication from texting to phone calls relies on digital signals, allowing faster, clearer, and more reliable transmission of information.