Notice means your employer must let you know in writing a certain number of days before your job finishes. How many days depends on how long you have been working for your employer:
Your employer must pay you if you were dismissed without the proper notice. You should be paid the salary you would have earned between the day you got the notice and the day you stopped working.
For example, you have worked six years for the same company. You show up for work one day and are told to go home, there is no more work for you. You should have been told four (4) weeks earlier that your job was going to end that day. Your employer owes you four (4) weeks salary because you were not given notice.