Headset for computer is a conventional headphone is attached to the microphone. Headsets come in all shapes and sizes, but the connection method they have one.
To connect the headset to the computer you need to insert two plugs at the end of the headset wire to the corresponding connectors of the computer sound card. Connectors on the sound card is usually not only different colors but also have the appropriate designation. Microphone connector usually pink in color and marked with icons in the form of a microphone. Connector for headphone, usually green in color and marked with with the headphones.
After you connect the headset plug to the ports on the computer, all sounds will come to headphones, and everything you say will fix the microphone.
Connectors for microphone and headphones laptops usually have only a marking in the form of a drawing of the device.