How to use the word "everyday" and "every day"?What's the difference? Thanks ! :)

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This is used to mean that something is happening daily..
Ex:We do this every day.
      Available all day every day.

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Yes, as just said:
Everyday describes something or an activity as being usual or common or ordinary.
Every day is used to describe how often an activity occurs.

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Watch this video will help you to understand exactly  :
www.youtube.com/watch?v=qL5BUdVNn_M

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I couldn't have answered it better than the ones who have already answered.

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"everyday"is a adj.For example,"a suit for everyday wear"

“every day"is a phrase.For example."I go to school every day/He exercises every day. "