A lot of software can be used to create it. The following is an example of "Digital Master", which is most commonly used by netizens. It can be completed in just 5 simple steps, as shown below:

Open Digital Master and click Add Photo

2. Save and return to Digital Master

3. Click the background music option

4. Click the option pointed by the arrow in the picture below

5. Select the export format

6. Click to start generating