# Variable
## What is a variable?
Think of a variable as a bucket. You can put values into it and remove values from it. To reference the variable, you must use its name.
{% hint style="info" %}
Keep in mind that variable values aren't saved, so when the app is closed, they get reset. You can use the [SharedPreference](https://wiki.sketchub.in/components/sharedpreference) block with a `ToStringWithoutDecimal` block to save their values.
{% endhint %}
## Different kinds of Variables
There are four different kinds of variables in Sketchware:
### Boolean
Booleans accept values like true and false
### Number
Number variables accept numbers
### String
String variables accept a string (text)
### Map
Map variables are for making maps with `key:value` pairs
## Blocks
### Set Boolean to
Sets a boolean variable to True or False
### Set Number to
Sets a number variable to the specified value
### Increase 1
Increases the number variable by 1
### Decrease 1
Decrease the number variable by 1
### Set string to
Sets a string variable to the specified value
