Identify and describe errors to users

Example of a descriptive error message for an invalid email address
Image description: A website titled, "Sign up to stay in touch." Below are 2 text fields. The email address text field is filled in with "mx_square@shapes" and has an error message that says, "This is not a valid email format." Below is the favorite movie field, filled in with, "I like all movies!" and no errors.

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