What can my camera actually do?

Have decided to have a really good look at my camera and see what it actually does. Took lots of pics of the castle, lights and the buildings. Most of them were rubbish,however I liked this one. What does ISO mean as a camera?

Had after work drinks and chat, finally being able to put a face to the blip pictures was fab. Just what I needed after a rough day. Looking forward to re run. Woohoo, Friday tomorrow.