Data Flow Control refers to the techniques used to manage the rate of data transmission between devices in a network. It ensures that a sender does not overwhelm a receiver with too much data at once, which can lead to data loss or corruption. By regulating the flow, systems can maintain efficient communication and optimize performance. Common methods of Data Flow Control include stop-and-wait, where the sender pauses until the receiver acknowledges receipt of data, and sliding window, which allows multiple packets to be sent before waiting for an acknowledgment. These methods help maintain a smooth and reliable data exchange.