When creating graph edge from 2 dimension array, what does arr[i][0], arr[i][1] mean?

Supposed edge relations are provided

    edges[][] = [[1,0],[2,0],[3,1],[3,2]] 

when trying to create node relation, for example

    List[] list = new ArrayList[10];
    for (int i = 0; i < edges.length; i++) {
        list [edges[i][1]].add(edges[i][0]);
    }

What does edges[i][1] and edges[i][0] mean here? Thanks