ifelse()

I have a problem with ifelse(), I do not understand how it works.

X<-c(2,2,1,1,0,0)
str(X)

num [1:6] 2 2 1 1 0 0

Y<-ifelse(X>0,1,0)
Y

[1] 1 1 1 1 0 0

Can some one explain what is going on, I do not understand what ifelse is
doing in this case. Can someone explain the output Y.

Thanks

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