What type of bond does phosphate form in a polynucleotide such as DNA?

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In polynucleotides, each phosphate group is bonded to two sugars. This forms a phosphodiester bond.
 11ec0fb7_2805_992f_95f0_0bb24689d46e_NR0002_00 A phosphoester bond is a bond between the phosphorous atom of a phosphate group and an oxygen atom. Each nucleotide contains one phosphoester bond, but this is not the bond that connects the nucleotides to one another.
The phosphotriester method is used for coupling of oligonucelotides.
A glycosidic bond or glycosidic linkage is a type of covalent bond that joins a carbohydrate (sugar) molecule to another group, which may or may not be another carbohydrate.

What Type of Bond Does Phosphate Form in a Polynucleotide