The word "than" implies comparison, and is used to make show a difference between two items. A sentence containing the word "than" could be the following:
Waffles are better than pancakes.
The word "than" is not to be confused with the word "then", which is used to show a sequence of activities. A sentence with the word "then" could be the following:
I woke up, then had waffles for breakfast.
Hope that helped! =)