is the root node nodes tcrand form path from to ( (bfigure sample tree with(athe root nodeand (ba path from to path the other nodes in the tree are accessed by following the edges starting with the root and progressing in the direction of the arrow until the destination node is reached the nodes encountered when following the edges from starting node to destination form path as shown in figure ( )the nodes labeled tcrand form path from node to node parent the organization of the nodes form relationships between the data elements every nodeexcept the roothas parent nodewhich is identified by the incoming edge node can have only one parent (or incoming edgeresulting in unique path from the root to any other node in the tree there are number of parent nodes in the sample treeone is node xwhich is the parent of and gas shown in figure (achildren each node can have one or more child nodes resulting in parent-child hierarchy the children of node are identified by the outgoing edges (directed away from the is the parent of nodes and and are children of node and are siblings jj the gray nodes are interior nodes the white nodes are leaves ( (bfigure the sample tree with(athe parentchildand sibling relationshipsand (bthe distinction between interior and leaf nodes