Arduino to receive wireless input and talk to server

I am involved in a simple project and I need a device that can receive a simple wireless input and can then talk to a server through an internet connection (we can program this). This is the receiving device.

The device that is sending the signal needs only to respond to a simple on/off in an electric circuit.

Does anyone know if an arduino device could be used here, either for the sender or the receiver?

You need to select your radio technology before you choose the hardware, and that will depend on the range and power requirements and the type of environment it needs to work in. There are various radio transceivers that can be driven via an Arduino, but no way to tell from this side of the screen which ones might be suitable for you.