Is it possible to make an array inside an other array in javascript?

Answer 1

Array inside array? Obviously.
Did you mean something like this?
var my_arr= [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9],
]

Answer 2

The boolean response to your question would be YES as Shashi Ranjan have you shown an example.

Otherwise you may discover more on your own by Google "multidimensional array javascript". 👌