ELI5: Explain Like I'm 5

Four-day week

A four-day week means that people work four days instead of the usual five days in a week. So, instead of going to work from Monday to Friday, they would work from Monday to Thursday and then the Friday is a day off! That means people get a whole extra day to do things like spend time with their families, do activities outside of work, or just have some extra time to relax.