# Basic containers

## Set

A set is a container of elements, where an element can only be contained once.

Instructions

Expressions

## List

A list is a container of elements, where elements are in the order they are added.

Instructions

Expressions

## Map

A map associates one key to one value.

Besides basic `map`

there are two other maps type:

`big_map`

to store large collections of non iterable key-value pairs`iterable_big_map`

for a large*iterable*collection of key-value pairs

Below is the list of map-related instructions and operators.

Note that `for`

instruction and `length`

builtin are **not** available for `big_map`

type.

Instructions

Expressions