This is the 52nd most frequent Chinese word.
看
"看" means "to look," "to watch," or "to see."
Here, '看' is used to mean 'look at' or 'observe' something with one's eyes.
我在窗边看风景。
I am looking at the scenery by the window.
In this case, '看' acts as an imperative, drawing attention to something.
看，你的书掉在地上了。
Look, your book has fallen on the ground.
Here, '看' is used in a repeating form '看看', meaning 'look at' or 'check out' in a casual or exploratory manner.