The fundamental difference between fixed-term and indefinite employment contracts lies in the nature and continuity of the commitment. A fixed-term contract is made for a specific period that automatically ends without the need for notice, and the terminating party is obliged to compensate the other party for the remaining period if terminated prematurely. On the other hand, an indefinite contract extends without a specified time frame and can be terminated with prior notice ranging from 30 to 60 days depending on the salary, with compensation for years of service upon unjustified termination.