What is arrays??

Answer 1

an array is a data structure that contains groups of element of similar data types

Answer 2

in java an array is like a collection of variables of the same type which are all accessed by one variable name and an index, like this:
//declaration of an int array of length 5 (5 ints can be saved)
int[] arr = new int[5];

//setting value of index 0 (start)
arr[0] = 1;

//getting an value from the array
System.out.println(arr[0]);

//getting the length of the array
System.out.println(arr.length);
//can be used in for-loops

Answer 3

a collection of datas.