For Samsung phones, you can also set a by heading to your "My Music" page in the Settings app and choosing a song stored on your device. Then tap to add the file as a ringtone.
A ringtone can be anything that makes an alert sound when you receive a call, from an MP3 file to a sound from a movie. You can even use voice recording. But there are some limitations to how you can use these files as ringtones.
Some services, such as Spotify and YouTube Music, lock their files for playback in their apps, so you can't use them to make a ringtone. If you're not sure what a music service locks, you can check the help section of the website for your particular service.
You can set any audio file in a supported format, such as MP3, M4A, WAV or OGG, as a ringtone on your Android device. It's easy to do, just save a copy of the file to your phone before you start.