'Every day' as an adverbial phrase describes the frequency with which an action occurs. It tells us how often something happens.
'every day' is always two words when describing frequency. It should not be confused with 'everyday,' which is an adjective meaning 'ordinary' or 'typical.'
I go for a walk every day.
She reads the newspaper every day before breakfast.
They practice the piano every day to improve their skills.
a common mistake is confusing 'every day' with 'everyday.' Remember, if you can replace 'every day' with 'each day' in a sentence and it still makes sense, then 'every day' is the correct choice. 'Everyday' as a single word is an adjective and might be used like this
'Jeans are his everyday attire.'