What does the expand.grid function in caret do?

@pagal_guy wrote:

hello,

set.seed(123)
fitControl <- trainControl(method = 'cv', number = 10, summaryFunction=defaultSummary)
Grid <- expand.grid( n.trees = seq(50,1000,50), interaction.depth = c(30), shrinkage = c(0.1),n.minobsinnode = 10)

I came across the above code while learning about ensembles.
Can someone please help me understand the function expand.grid and it's parameters.
I tried R help but:

Kindly help!!

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