Why is Implicit Runge-Kutta implicit?

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Why is Implicit Runge-Kutta implicit? Moreover there is adaptive Runge-Kutta, etc. All of them them can solve IVP problem (implicit differential equation). What the real reason why this particular method is implicit?

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You surely refer with IVP to Initial Value Problems?

"Implicit" in general means that to get to the desired value you have to solve a , in general non-linear, system of equations instead of just evaluating a function, which would give you an explicit method to get at the desired value.