Yad is a Hebrew word that means "hand" and it is often used to describe a special pointer that Jewish people use to read and follow along in the Torah, which is the Jewish holy book.
So imagine you have a really special book, kind of like your favorite bedtime story, but it's really long and it's written in a language that you might not be able to understand very well on your own. But you really want to be able to read and learn from it, so your parents or teachers give you a special pointer called a yad.
The yad is kind of like a magic wand that helps you follow along with the words on the page. You hold onto it with your hand, just like holding a crayon or pencil, and you use it to point at the words as you read them. It helps you keep your place on the page, so you don't get lost or confused.
And even though the yad might seem like a simple tool, it's actually a really important symbol in Jewish culture. It represents the idea of being careful with and respectful of the Torah, and it shows that reading and learning from this special book is something really special and sacred.