Some examples of the most popular and commonly used low noise bearings are as follows:

Automotive Bearings - these provide low noise as well as low vibrations. As the name states this type of low noise bearings can mainly be found within automobiles.
Pulley Ball Bearings - this type of bearing is considered to be of a high precision class with low noise and again, low vibrations.
Deep Grove Ball Bearings - you will often find that this is small in size as well as being a low noise bearing.
Inserted Super-Grinding Ball Bearings - you will find that these ball bearings are taper plastic roller coated as well as being low noise and having a long lifespan.

The concept of a bearing is to permit constrained relative motion between two parts; this is typically rotation or linear movement. Also the way in which bearings may be classified are according to the motions that they allow and to their principle of operation as well as the directions of the applied loads that they can handle.

The quieter a bearing can be the better. They usually come in three classifications of noise, which are as follows:

High band - 1,800 - 10,000 Hz
Medium band - 300 - 1,800 Hz
Low band - 50 - 300 Hz