Imagine that you have a lot of toys and you want to play with them together. But some of your toys need special instructions to play with them, like how to turn on the lights of your toy car or how to make your toy robot walk.
In the same way, different software applications can work together to make something really cool, but they need special instructions too. This is where the Fabric Application Interface Standard comes in. It's like a set of rules that tell different software applications how to talk to each other and work together to make something useful.
So, just like how you need to follow instructions to play with some of your toys, software applications need to follow the Fabric Application Interface Standard to play nice with other software applications.