The steps of automatically playing PPT background music are as follows:

1. Open the PPT file to which background music needs to be added, select the first slide, click the Audio button in the Media group under the Insert tab, and select Audio in the file from the drop-down list.

2. in the "insert audio" dialog box that appears, select the file to be inserted and click the "insert" button.

3. When the audio file is inserted, you can see a small speaker icon and a progress bar on the slide. Don't worry about this, it will disappear when the slide is played.

4, and then the more important step is to set the Start option in the Audio Options group under the Play tab in the Audio Tools option group to Automatic. In this way, audio can be played automatically.

5. At this time, check the "Loop until it stops" check box on the right.

6, so the automatic playback of PPT is set successfully.

the function of PPT is as follows:

the function of PPT is to show the content to the audience intuitively and vividly in the form of words, graphics, colors and animations, so that the audience will be impressed by what you want to express.

It is embodied in the following three aspects:

1. Attract

Attract the audience's attention with beautiful and dazzling plane and animation design, and draw their attention to your presentation;

2. Guide

Use PPT to help us highlight the key points of the demonstration, help the audience understand the content of the demonstration and keep up with the rhythm of the demonstration;

3, experience (Effect )

Use PPT to help create a suitable presentation atmosphere, and enhance the audience's good impression of the presentation through perceptual visual signals.