Arabic (unicode block) is a special code that computer programs use to show Arabic letters on your computer or phone.
Think of it like a secret code that tells your computer what letters to show when you type something in Arabic. This code includes all the different shapes that the letters can look like depending on where they are in a word.
For example, the letter "Baa" (ب) might look different at the beginning, middle, or end of a word. The Arabic (unicode block) code has all of these different versions of the letter, so your computer knows which one to show based on where it is in the word.
This code is very important because it helps people all over the world communicate in Arabic, even if they are not in an Arabic-speaking country. Without it, your computer would not be able to show Arabic letters correctly and you wouldn't be able to read or write in Arabic on your device.