You might find it hard to focus when it's too quiet. As this video from SciShow explains, that's because when it's quiet, a single sound is accentuated, diverting your attention. White noise can help with that, and there are other colours of noises, too, depending on the frequency. As the video explains, white noise has a higher frequency and we perceive it to sound louder than it really is. Pink noise, which they play in the video, takes this into account and balances out the frequency. So when the frequency is higher, the volume is lowered. Brown noise, which sounds like a low rumble or an ocean, lowers the higher frequencies even more.
Apps like Noisli can generate these sounds for you to keep you focused while you work. They come in handy in different noise environments, even quiet ones. As SciShow explains, when our environment is too quiet, our ears pick up every little noise, making it hard to keep our attention on anything else.
This is good to know when it comes to working or studying, but it applies during sleep, too.
...a dripping tap or snoring partner in a quiet room can lead to some pretty frazzled nerves, but white pink and brown noise playing across all frequencies are like muffling blankets of sound. They mask other sounds by making them less significant compared to the background. So the solution to annoying noises can sometimes be more noise. Sounds that come in many colours
For more detail, check out the video in full.