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Arraylist And parameter Java

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Hello  Please Help me 🙏❤️

From my understanding
A method uses parameters, A caller passes arguments.
And i am just learning about arraylist

what i cant understand is what parameter means in the following syntax the bold ones

add(Object  elem)
Adds  the  object parameter to  the  list.

remove(int index)
Removes the object at the index parameter.

remove(Object elem)
Removes this object (if it’s in the ArrayList).

contains(Object elem)
Returns ‘true’ if there’s a match for the object parameter

Returns ‘true’ if the list has no elements

indexOf(Object elem)
Returns either the index of the object parameter, or -1

Returns the number of elements currently in the list

get(int  index)
Returns  the  object  currently  at  the  index  parameter

I am confused what does object parameter and index parameter means??
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Please always tell us where such information comes from. Is it from the documentation for the API? It doesn't look like what appears here for List.
It means simply that it uses the parameter to which an argument is sent, and that parameter is an int, or an Object. At least that is what it looks like to me.
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