In photography, ISO refers to the level of sensitivity film or a digital sensor has to light. Generally speaking, the more sensitive your camera is to light, the lower the resolution will be due to the appearance of digital noise, also known as "grain."
ISO
ISO numbers are measured in hundreds, ranging from 100 to 3200 or higher. The lower the number, the less sensitive your camera is to light. The higher the number, the more sensitive it will be, meaning you can take pictures in lower light situations.
Resolution
Resolution refers to the number of pixels per inch (PPI) in the finished image. While the total pixel count for an image cannot be changed, the PPI, or resolution, can. The more PPI, the higher the resolution and quality of the photo, while less PPI will result in a grainy, lower quality image.
The Connection
While photographers don't use the term "ISO resolution," ISO settings can affect the final quality of an image; the higher the ISO, the more noise and lower quality. Additionally, the resolution of an image can be adjusted in photo processing software, making even low ISO images look grainy and of low quality.
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