What is the difference between "salary" and "wage"?

Generally, people who get paid a "salary" get their money monthly, and get the same amount each month. A salary usually doesn't change based on the number of hours you work. 

If you get paid a "salary", you usually say things like "I make $30,000 a year."

If you get paid a wage, it usually means that you get a certain amount per hour. The more hours you work, the more money you will make.

Here are some examples with "wage" and "wages":

What's the minimum wage in the U.S. these days?

Most people in the film industry don't even make a decent living wage.

The government takes almost 30% of your wages for taxes.

They're considering cutting wages due to the recession.

"Wages" usually refers to the actual money that a person makes, while "wage" is a more abstract idea of the rate for a person's time.