Computer programs are made up **data structures** which use conditions and decisions that bring the desired outputs. We will use Python notation here, as it is simple, and you may have seen it before. The basic data structures are:

- Iterators such as while loops and for loops. An iterator loops as many times as it is told to, running other commands each time it goes around
**Decision Points**such as**If structures**and**Case structures**. The preceding image is a diagram of a set of nested**If structures**Boolean Operators

**Notation****Description**X == Y

X is equivalent to Y. This is not always a numeric value set

X != Y

X is not equivalent to Y

X <= Y

X is smaller than OR equivalent of Y

X >= Y

X is greater than or equivalent ...

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