What is the meaning of interaction depth in gbm using 'caret' in R

@hackers wrote:

Hello,

While using gbm for a classification problem I came upon the interaction.depth option in the tunGrid function for gbm using caret

gbmGrid <-  expand.grid(interaction.depth = c(1, 5, 9),
                        n.trees = (1:30)*50,
                        shrinkage = 0.1,
                        n.minobsinnode = 20)

I am not being able to understand what this option does and why is it used?
Can someone please help me with this??

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