What you are reading is a measurement of distance – 4nm refers to four nano meters, or 0.000000004 meters.
In terms of computers, this refers to the size of the transistors on the chip – this is a critical component of a computer, with billions being required to make up a modern processor. The smaller the transistor, the more you can fit on to the same size of chip, and the closer together they can be placed.
All other things being simplified and equal, the more transistors you have, the better the performance can be.
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