Parallel programming is performed through the Parallel API in C#. If any method performs long-term work, that work is divided into small parts and given to separate cores. This way the method works faster. For example, if you have built a cycle up to 10 billion, it takes a long time to wait for it to be executed in one core. Parallel programming divides the method into smaller Tasks and transmits them to the cores, and the operation takes place faster and in the same time interval.