Packet Switching is a method used in computer networks to send data in small, manageable pieces called packets. Each packet contains a portion of the data, along with information about its destination. This allows multiple packets from different sources to travel through the network simultaneously, improving efficiency and speed. When packets reach their destination, they are reassembled in the correct order to form the original message. This technique is more flexible than traditional methods, as it can adapt to network congestion and route packets through the best available paths, ensuring reliable communication across the Internet.