Everyday vs Every day

Maybe you have asked yourself why 'every day' can be written 'everyday' as well. Do you know the difference? It's quite simple.
EVERYDAY is an adjective. It means 'commonplace' or 'ordinary'.
EVERY DAY is a temporal expression. It means 'each day'.

Have a look at these two examples:
- Don't use the everyday dishes. Today's a special occasion.
- I have to work every day.