Every day - here every is a determiner and day is a noun, so it is written as two distinct words.
When you say every day you mean each day without exception.
For example:
You have been late for school every day this week.
Everyday is an adjective, and is written as one word.
When you say everyday you mean ordinary, unremarkable.
For example:
My culture pages offer an insight into the everyday life of Britain.
!Note - if you want to check yourself see if you could write "every morning" or "every evening" without loss of meaning. Then you'll know it should be "every day".
I am reliably informed that in the US people happily use everyday for every situation.
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