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A cracker is an individual who performs cracking, or the process of breaking into a computer or a network system. A cracker might be performing cracking for malicious activities, profit, for certain nonprofit intentions or causes, or just for a challenge. Some crackers break into a network system deliberately to point out the flaws involved in that network's security system. In most cases, crackers aim to gain access to confidential data, get hold of free software applications, or carry out malicious damage to files.

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A computer hacker is any skilled computer expert that uses their technical knowledge to overcome a problem. While "hacker" can refer to any skilled computer programmer, the term has become associated in popular culture with a "security hacker", someone who, with their technical knowledge, uses bugs or exploits to break into computer systems.

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Spam refers to the use of electronic messaging systems to send out unrequested or unwanted messages in bulk.

The difficulty with stopping spam is that the economics of it are so compelling. While most would agree that spamming is unethical, the cost of delivering a message via spam is next to nothing. If even a tiny percentage of targets respond, a spam campaign can be successful economically.

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A computer virus is a type of malicious software that, when executed, replicates itself by modifying other computer programs and inserting its own code.[1] When this replication succeeds, the affected areas are then said to be "infected" with a computer virus.[2][3][4]

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.Spyware is software that aims to gather information about a person or organization sometimes without their knowledge, that may send such information to another entity without the consumer's consent, that asserts control over a device without the consumer's knowledge, or it may send such information to another entity with the consumer's consent, through cookies

"Spyware" is mostly classified into four types: adware, system monitors, tracking cookies, and trojans;[2] examples of other notorious types include digital rights management capabilities that "phone home", keyloggers, rootkits, and web beacons.

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Malware (a portmanteau for malicious software) is any software intentionally designed to cause damage to a computer, server or computer network.[1] Malware does the damage after it is implanted or introduced in some way into a target’s computer and can take the form of executable code, scripts, active content, and other software.[2] The code is described as computer viruses, worms, Trojan horses, ransomware, spyware, adware, and scareware, among other terms. Malware has a malicious intent, acting against the interest of the computer user—and so does not include software that causes unintentional harm due to some deficiency, which is typically described as a software bug.