Depending on what you plan to do with your Raspberry Pi 5, and how hard you want to push the board, you may need to consider cooling options to avoid the board throttling performance when it hits peak temperatures.
The Raspberry Pi 5 CPU does get hot during usage, however for simple tasks such as basic coding, you can get away without using a fan or heatsink.
If you want to stream video, browse the web, run intensive applications, play games or other CPU-intensive tasks, we recommend taking measures to keep your board cool.
Popular options are the Raspberry Pi 5 case with its included heatsink and internal cooling fan, or the mighty Active Cooler. Both of these products use a PWM fan too, so noise will be kept to a minimum when your board isn't working hard.