Hacker 1 hkr n informal 1 a one who is proficient at using or programming a computer a computer buff b one who uses programming skills to gain illegal access to a computer network or file 2 one who demonstrates poor or mediocre ability especially in a sport a weekend tennis hacker perhaps from hacker amateurish or inept golfer or . Hacking generally refers to unauthorized intrusion into a computer or a network the person engaged in hacking activities is known as a hacker this hacker may alter system or security features to accomplish a goal that differs from the original purpose of the system. English language learners definition of hacker computers a person who secretly gets access to a computer system in order to get information cause damage etc a person who hacks into a computer system. Definition hacking is an attempt to exploit a computer system or a private network inside a computer simply put it is the unauthorised access to or control over computer network security systems for some illicit purpose
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