The choice between "every day" and "everyday" depends on the context and the intended meaning.
"Every day" (two words): This phrase is used when referring to something that happens each day or on a daily basis. "Every" is an adjective modifying the noun "day."
Example: "I go for a walk every day."
In this example, the speaker is emphasizing that they go for a walk on a daily basis.
"Everyday" (one word): This is an adjective that means ordinary, commonplace, or typical. It describes something that is a regular part of everyday life.
Example: "She wore her everyday clothes to the grocery store."
In this example, "everyday" describes the clothes that are ordinary or commonly worn in day-to-day activities.
It's important to note that "everyday" is not used as an adverb to describe frequency. In such cases, "every day" should be used.
Example (correct): "He exercises every day."
Example (incorrect): "He exercises everyday."
In summary, "every day" is used to describe something that happens each day, while "everyday" is used as an adjective to describe something ordinary or commonplace.