(n.) Verification that something is correct or conforms to a certain standard. In data collection or data entry, it is the process of ensuring that the data that are entered fall within the accepted boundaries of the application collecting the data. For example, if a program is collecting last names to be entered in a database, the program validates that only letters are entered and not numbers; or in a survey collecting data in the form of “yes” or “no” questions, the program validates that only those responses are used and not some other word.
Validation procedures typically are written into the program code and are therefore invisible to the user.
Other forms: validate (v.)
- vampire tap
A cable connection used to connect transceivers to a Thicknet coaxial cable in an Ethernet network in a bus topology. Instead of cutting the cable and attaching connectors to both ends of the severed coaxial cable, a vampire tap pierces through (hence the name vampire) the insulating layer of the cable and makes direct contact […]
(adj.) Without added features. A “vanilla PC,” for example, would be a PC with all standard components.
A sarcastic term used to designate software and hardware products that have been announced and advertised but are not yet available.
A symbol or name that stands for a value. For example, in the expression x+y x and y are variables. Variables can represent numeric values, characters, character strings, or memory addresses. Variables play an important role in computer programming because they enable programmers to write flexible programs. Rather than entering data directly into a program, […]
- variable length
Refers to anything whose length can vary. For example, in databases, a variable-length field is a field that does not have a fixed length. Instead, the field length varies depending on what data is stored in it. Variable-length fields are useful because they save space. Suppose, for example, that you want to define a NAME […]