sentences:  Another classic development in computing systems is direct memory access (DMA), in which a device can access main memory directly while the CPU is free to perform other tasks.In a network with "remote direct memory access" (RDMA), the sending NIC uses DMA to read data in the user-specified buffer and transmit it as a self-contained message across the network.The receiving NIC then uses DMA to place the data into the user-specified buffer.