Qays is a word that is used to talk about the relationship between two people who really love each other, like best friends or siblings. When people have a qays, it means they care a lot about each other and want to be close all the time.
Think of it like when you have a favorite toy that you always want to play with and take care of. A qays is kind of like a toy, but it's a person instead. People with a qays feel happy when they are together and sad or lonely when they are apart. They might even do things for each other, like share their toys or snacks, to show how much they care about each other.
Some people call qays a "love bond" because it's a really strong connection between two people, just like how a string ties two things together tightly. When you have a qays, you know that person will always be there for you, no matter what happens.