Arduinos don't have a dedicated audio port, like you might find it on your laptop or smartphone. For it to play sound, you need external components, like an audio shield and of course a speaker or headphones.

<aside> ⚠️ Arduinos are not the best at playing sounds, especially high quality audio.

Look at the 'Alternative' section to see if there is a more suitable approach for your needs.

</aside>

Tutorial

Using only Arduino parts:

How to Make an Audio Player With Speaker Using the Arduino Uno | Arduino

Using Grove:

Grove - Serial MP3 Player

Alternatives

Arduinos are not the best at handling complex tasks, which includes playing audio. A valid approach is also to play the sound through a computer using MAX | MSP or Processing and only using the Arduino as a control device only.

Tutorial: Sound - Arduino to Processing : ARTC 4330/5330