PROBLEM UNDERSTANDING B-Trees

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template <class recType, int bTreeOrder>
struct bTreeNode
{
    int recCount;
    recType list[bTreeOrder - 1];
    bTreeNode *children[bTreeOrder];
};


The above code implements a B-Tree node. I don't understand what int recCount; is for. And also what each array does
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recType list[bTreeOrder - 1];
bTreeNode *children[bTreeOrder];
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