The Oxford English Dictionary defines 'random' as: "Having no definite aim or purpose; not sent or guided in a particular direction; made, done, occurring, etc., without method or conscious choice; haphazard." This concept of randomness suggests a non-order or non-coherence in a sequence of symbols or steps, such that there is no intelligible pattern or combination.
The first step in protecting your online privacy is creating a safe password - i.e. one that a computer program or persistent individual won't easily be able to guess in a short period of time. This Google page has some useful tips for passwords.