One of the worst curses of modern digital photography seems to be the noise.
There are, indeed, some areas in which its reduction is important, for example in night photography and astronomy.
The noise, however, can sometimes be a valuable and useful ally, especially if you plan to print our pictures.

Many use an “artificial film grain”, available also with special plugins, including Google Nik Collection and RealGrain by Imagenomic, which even allow famous film emulation, for a vintage effect.
For me, however, a certain amount of natural noise, or graininess artificially induced, have another value, to return an aspect of “material” to the press, especially if large.
The prints very large, in fact, are made to be seen from a distance, and the presence of a graininess (obviously controlled) makes them more natural.
An excess of sharpness, sometimes sought obsessively, in contrast, can make the image too “artificial”.
As in other cases, of course, the use of noise must be seen as a simple tool, to be used with care and sparingly, taking several printing tests.
I show you the tools emulation film Nik Analog Efex Pro and RealGrain by Imagenomic.
A curious note: Imagenomic also markets a great plugin for noise reduction, Noiseware.