Arduino over a Network I am new to arduino programming. I want to sense temperature and send it to a server in my college. I am using Arduino Uno R3 board which has ATmega 328P micro-controller. I am able to get serial output on my PC but is there a way in which I can send temperature data to the server in a packet format using Arduino Programmer and not using Ethernet Shield ? Please answer in a less complex way.
Without an ethernet shield or some kind of other internet connectivity shield/circuitry you cannot communicate directly with the internet through the arduino. However, if having a computer as the internet communicator isn't a problem you could try a setup like:

arduino->serial (usb)->processing->internet

This way you create the internet packet in processing using the temperature information received through serial from arduino.

see also https://processing.org/