Is JS "random()" actually random?

Question

I am seeing suggestions that its pseudo-random.
Don't even know what that means..

Answer 1

It is not truly random.

As far as i know, every browser have their own method to manage the "randomizer", for example Firefox use the local time to generate a random number from 0 and 1. :)

Atmospheric noises and Cosmic radiations can also be used to generate truly random numbers - https://math.stackexchange.com/questions/2056780/is-it-possible-to-generate-truly-random-numbers-using-a-computer

Answer 2

interesting read
https://www.infragistics.com/community/blogs/tim_brock/archive/2016/07/14/foundations-of-random-number-generation-in-javascript.aspx