are programs that do not follow the rules of structured logic
Structured program
are programs that do follow the rules of structured programming
A Structure
is a basic unit of programming logic; each structure is a sequence, selection, or loop
a sequence structure
contains a series of steps executed in order. A sequence can contain any number of tasks, but there is option to branch off and skip and of these tasks.
A selection Structure (decision structure)
contains a question, and, depending on the answer, takes one of two courses of action before continuing with the next task