A malicious code can be a program. It can also be a part of a program. Further a malicious code can attach itself to a good program. In that way the malicious effect occurs first when the good program runs.

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One of the greatest miscalculations a business owner can commit is by not prioritizing how he will protect his computer system from unauthorized intrusions and data theft.

1. Input Checking

Always check user input to be sure that it is what you expected. Make sure it doesn't contain characters or other data which may be treated in a special way by your program or any programs called by your program.
This often involves checking for characters such as quotes, and checking for unusual input characters such as non-alphanumeric characters where a text string is expected. Often, these are a sign of an attack of some kind being attempted.