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Java has a reasonably easy-to-use builtin networking API which makes it easy to communicate via TCP/IP sockets or UDP sockets over the internet. TCP is typically used more often than UDP.
When a client wants to open a TCP/IP connection to a server, it does so using a Java Socket. If we want to run a server that listens for incoming connections from clients on some TCP port, we have to use a Java ServerSocket. When a client connects via a client socket to a server's ServerSocket, a Socket is assigned on the server to that connection. The client and server now communicates Socket-to-Socket. When we send data via TCP you first create a connection. Once the TCP connection is established TCP guarantess that your data arrives at the other end, or it will tell you that an error occurred.
DatagramSocket's are Java's mechanism for network communication via UDP instead of TCP. To send data via Java's DatagramSocket we must first create a DatagramPacket. With UDP you just send packets of data (datagrams) to some IP address on the network. We have no guarantee that the data will arrive. We also have no guarantee about the order which UDP packets arrive in at the receiver. This means that UDP has less protocol overhead (no stream integrity checking) than TCP.
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