What is this

Can someone explain to me what this is and what it means and what it does ? I’m a newbie

public static System.Runtime.CompilerServices.CallSiteBinder BinaryOperation (Microsoft.CSharp.RuntimeBinder.CSharpBinderFlags flags, System.Linq.Expressions.ExpressionType operation, Type? context, System.Collections.Generic.IEnumerable<Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo>? argumentInfo);