What is iso?
For digital photography, ISO refers to the sensitivity—the signal gain—of the camera's sensor. The ISO setting is one of three elements used to control exposure; the other two are f/stop and shutter speed.
This information was sourced from google.
Using iso in my own Photography
The settings I used in these photos are; auto, 100, 200, 400, 800,1600, 3200 and 6400.
Best Images
These are my best images because the photos have a very suttle lighting to them and one of the images look to greeny and its not how I want my images to look.
Worst Images
These are my worst images because the lighting in the image is too bright and on the right side the plant is not very visible because it is too bright.