Seven
In short
Seven is the natural number that comes after six and before eight. It is a prime number and a common digit used in many counting systems.
In plain words
It is the amount you get when you count six items and add one more. It is a special number because it cannot be divided evenly by any other number except one and itself.
A simple example
If you have a week, you have seven days. If you roll a standard six-sided die, you can never roll a seven.
Why it matters
The number is significant in mathematics as a prime number. It also appears frequently in human culture, such as the number of colours in a rainbow.
Easy to mix up
People sometimes confuse it with six or eight when counting quickly in a sequence.