What is it

Short for structure.

struct is a collection of members of different data type into a single variable.

type Vertex struct {
	X int
	Y int
}

func main() {
	fmt.Println(Vertex{1, 2}) // {1 2}
}

vs Array

Arrays are used to store multiple values of same data type into a single variable.

Structs are used to store multiple values of different data types into a single variable.