1. The Galactic Core: This is the central region of the Milky Way and is where most of its mass is concentrated. It is home to a supermassive black hole called Sagittarius A*.

2. The Bulge: This is a region of stars that surrounds the Galactic Core and is made up of old, metal-rich stars. It has roughly a spherical shape and is the oldest part of the Milky Way.

3. The Galactic Disk: This is a flat, rotating disk of stars and gas that extends out from the Galactic Center. The Sun and most of the stars we can see with the naked eye are located in the Galactic Disk.

4. The Spiral Arms: The Milky Way is classified as a barred spiral galaxy, meaning it has multiple elongated spiral arms that extend from the Galactic Core. These spiral arms are where most of the star formation in the Milky Way occurs.

5. The Galactic Halo: This is the outer region of the Milky Way and is made up of a diffuse cloud of stars, gas, and dark matter. It is the least well-understood part of the Milky Way and is still the subject of much research.