"Newbie" is the name commonly given to someone who has a minimal or non-existant amount of knowledge in a given topic, more commonly in, what seems to be, many given topics.
Somewhat lesser known, however, is that we are all newbies, for to be constantly neither naive nor ignorant would constitute someone who would become either one or both of two things:
Ruthless: like a politician.
Insane: think emo (but not for long, it hurts after a while).
Related links: most 12 year old's livejournals.
Newbie started a new chapter with the advent of counter-strike. The poor person who went and purchased counter-strike was soon pwned like the n00b they were. This was one of the reasons for the columbine massacre.