Pseudo Random vs True Random

True random systems measure a physical process, such as electronic noise. Pseudorandom systems use a deterministic algorithm that begins with a seed. The word “pseudo” can sound weak, but modern cryptographically secure generators are designed so their output cannot feasibly be predicted from previous results.

Which one do you need?

Physical randomness is valuable for specialised scientific or cryptographic systems. For ordinary web tools, secure tokens, games, and fair draws, an operating-system-seeded cryptographic generator is fast and appropriate. A basic predictable generator, however, should never be used for passwords or security keys.

The important question is therefore not only “true or pseudo,” but whether the generator is securely seeded, unbiased, and suitable for the decision being made.