What type of bonds form between the nitrogenous bases? why are these bonds important?

The bonds that are formed between nitrogenous bases are Hydrogen Bond.

Explanation:

When a hydrogen atom interract with an electronegative atom such oxygen,fluorine hydrogen bond forms,

              A single hydrogen bond is weak noncovalent bond but collectively they exerts  very strong interraction.

            Hydrogen bonding occurs between complementary base pair .For exam An adenine base forms 2 hydrogen bonds with thymine base whereas guanine forms 3 hydrogen bonds with cytosine base.

             The hydrogen bonding between complementary is very much important to stabilize the structure of DNA .

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.