Hijazi script is a very old way of writing that was used in parts of the Middle East over a thousand years ago. It's kind of like fancy handwriting that people used to write down important things like religious texts and legal documents. Imagine going back in time to a time when computers and phones were not around and people had to write everything down with their hands.
Now, when you write something down, you usually use what is called the Latin alphabet - so letters like A, B, C, and so on. But in the past, people didn't have this kind of handwriting. They used different shapes to represent different sounds. The letters used in Hijazi script look very different from the letters we use today. They are more curved and created with fewer strokes.
The Hijazi script was used to write down the Arabic language which is the language that many people in the Middle East speak. The script was very important because it helped people to read and understand the teachings of the Quran, which is the holy book of the Islamic religion.
Overall, the Hijazi script is a very old and important way of writing that was used a long time ago. Although it's not used anymore, it helped people to communicate and understand important messages thousands of years ago.