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Form 16 is just like your annual salary statement that your employer gives you. It contains such details as are required for you to fill your Income Tax Returns. Most of the items from Form 16 need to be copied as-is into your I-T Returns sheet, so do not worry even if you do not understand some of the terms used in the Form!
Since the deadline for tax filing for salaried persons is 31st July, make sure you get your Form 16 from your employer well before that. In case employer has not deducted any tax from your salary (this can happen if your income fell below tax limit), they may not issue a Form 16, and only give you a Salary Advice Slip instead.