These two terms are sometimes used interchangeably, but should be used correctly so that there is no confusion about expectations.

A salary is a set amount that one would earn in a month or year, for a job description, but not necessarily for performing continuously during that time.  For example, you might take 3 weeks off in a month and still be paid the full salary and benefits.

On the other hand, a wage is a payment for a much smaller unit of time, perhaps an hour, a day or a week.  In this case, if you don’t work, you don’t get paid at all.