Why we use {0}&{1} instead of x&y???

Question

static void Main(string[] args)
{
int x = 10;
double y = 20;

Console.WriteLine("x = {0}; y = {1}", x, y);
}

Answer 1

0 and 1 represents the parameters.. which can be used within strings.. so {0} {1} will point to the arguments supplied at the end of the statement