Wage is the the money the workers/labourers earn at the end of the day or week. It is a term which is used when refering to a job which is done on contract basis or for white collar non-managerial jobs. Salary is a term for monthly/bi-monthly amount of money which is paid to (typically) permanent employees. Generally refered for white collar jobs

I wrote this as an answer to a similar question not too long ago, so I'm pasting here. Generally it's as follows, however the term "wages" is sometimes used to mean any money earned including money from a salary. A salary is a set amount of money paid for work regardless of how many hours the person spends working. Usually expressed in the amount received in a year. If a person on a salary works 10 hours a week or 40 hours a week, that person's pay does not change. A person that does not receive a salary usually gets paid a set amount for each hour that he or she works. This is referred to as a "wage". If the person works for 10 hours, he or she gets paid for 10 hours. If the person works for 40 hours, he or she gets paid for 40 hours. Bob's salary is $42,000 a year. Fred's wage is $12.50 a hour.