How does Shazam know what song is playing?

Related questions

1. Does Shazam work with live music?
2. What is Shazam app used for?
3. Does Shazam work with humming?
4. Did Snapchat remove Shazam?
5. How do you find songs on Instagram stories?
6. How long does it take Shazam to identify a song?
7. Does Spotify have Shazam?
8. How do I find a song on Instagram?
9. Is there a Shazam for PC?
10. Does Shazam work with Amazon music?

Tags

1. #based
2. #album
3. #acoustic
4. #finds
5. #being
6. #audio
7. #microphone
8. #shazam
9. #match
10. #computer
11. #compares
12. #title
13. #artist
14. #fingerprint
15. #central
16. #sample
17. #information
18. #gather
19. #played
20. #database
21. #smartphone
22. #brief
23. #against
24. #sends
25. #built
26. #creates