There are 7 days in one week.
After seven days go by, a brand new week begins. Seven days always come in the same order.
More facts about Days of Week
The days are Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday.
Saturday and Sunday together are called the weekend.
After Sunday, the week starts all over again with Monday.
In Vietnamese, most weekdays are named with numbers.
A week has 7 days because people once named them after the sky.