How to record sound using computers?

You need a sound card. In addition, you need a microphone if you want to record sound.

After connecting suitable hardware, you need to have a program to record the sound or music. There are many programs that can do this (better saved as mp3 format). One of the simplest programs is Sound Recorder (only can saved as wav format by default) that comes with the Windows systems.
 

1. First of all, you need to make sure a sound source is selected. Our sound source is the microphone. Open the Volume Controls by right-clicking the little speaker at the lower-right corner of the window.
   
   　
2. Choose Options-> Properties command to bring up the Properties dialog box. (see Figure 1)
   
   　
3. Select Recording and make sure the box to the left of the word 'microphone' has a tick mark. Then click OK.
   
   　
4. A column with the heading 'microphone' will be shown. Click the box to the left of the word 'Select' in the microphone column to select it. A tick mark should be shown. (see Figure 2)
   
   　
5. Start Sound Recorder by choosing Start -> Programs -> Accessories -> Multimedia -> Sound Recorder.
   
   　
6. Close the dialog boxes. Now you are ready to record a speech.
   
   　
7. Click the record button to start recording.
   (see Figure 3)
   
   　
8. Speak aloud to the microphone. When you finished, click the stop button.
   
   　
9. You may click the play button to listen to your recording.
   
   　
10. Save the file by choosing the File->Save command. Give a meaningful name to your file.