Given an array arr[] of integers, segregate even and odd numbers in the array. Such that all the even numbers should be present first, and then the odd numbers.

Below is the correct code that I need help in understanding. Why do we have the 0i n 0 for i in range(n)? and I dont understand why we have a[index]=arr[i] ?and ind+=1 what is ind? and where is the function that sorts if the integers are even and odd and sort them. Also why do we have end=" " in the print statement, what does end=" " do?