The way our modern world works, devices that have a receiving apparatus work to deliver their goal. Radio frequencies are received by antennas to bring you music and listen to talk shows. Command centers receive satellite images from beyond the atmosphere through satellite reception towers. Cameras work in a similar fashion as they use the lens as a conduit to receive the image and store it within the device. The only problem with devices like these are their inability to perfectly filter the intended information going into the receptors. As such, there are excess and unwanted appendages that travel along this receiving tunnel, and these are called noises. For radios, they are the constant sound similar to paper being crumpled. For real estate photos, they are the imperfections and textures we see in an image. They appear to be all over the image and may or may not follow a pattern.
Reference: https://www.blog.photoandvideoedits.com/real-estate-photo-editing-services/the-best-ways-to-reduce-noise-in-your-real-estate-photos/