Okay kiddo, have you ever seen those stripes on the road that help people cross the street safely? They're called crosswalks! And just like those stripes on the road tell people where it's safe to cross, crosswalk metadata tells a computer program where it's safe to find certain information.
So imagine asking a computer program to find all the pictures of dogs on a website. That program needs to know where to look on the website to find those pictures. Crosswalk metadata helps the program by showing it where to find certain information, like the location of the pictures of dogs.
Think of it like a map that helps a program navigate a website. Crosswalk metadata is the information on that map that shows the program where to go to find what it's looking for. Does that make sense, kiddo?