How would you define security?

the state of being free from danger

Lack of Fear

Computer and network security is achieved, when the administrator of the aforementioned, has 100% complete control over every aspect of said [computer] system or network....

In terms of home security, it is measures that are put in place preventing or detering intruders from unathorized entry into your home with the intent of removing and taking away your possessions and/or to cause damage or vandalism within your property. Some great advice on burglar alarms to prevent a break-ins can be found at Home Security Systems Advice .

Being able to go to sleep at night in your own bed in your own home in your own town and leave the door unlocked knowing nothing bad would ever happen.

In information technology, security is the protection of information assets through the use of technology, processes, and training

Data security is the means of ensuring that data is kept safe from corruption and that access to it is suitably controlled. Thus data security helps to ensure privacy. It also helps in protecting personal data

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Computer security is a branch of technology known as information security as applied to computers and networks. The objective of computer security includes protection of information and property from theft, corruption, or natural disaster, while allowing the information and property to remain accessible and productive to its intended users. The terms computer system security, means the collective processes and mechanisms by which sensitive and valuable information and services are protected from publication, tampering or collapse by unauthorized activities or untrustworthy individuals and unplanned events respectively.