Almost all modern cars are build with a metallic car paint finish. It's an easy thing to have a metallic car paint and with a good clear coat on top, it's not big of a deal to have a shiny looking vehicle. Some cars, however, still got a single stage paints.
Single stage paint is a different kind of car paint, where there's no basic paint covered with clear coat, but more like just colored clear coat (or a mixture between clear coat and a paint), that's just "one stage" of a finish over the car's metal parts. The clear coat itself is both the paint and the protective "cover" over it.
Having a single stage paint and trying to make it shiny sometimes might be a tough one to handle, but most people aren't aware, that those dull looking single stage finishes can be brought back to life even without a machine polishing and compounding. It can be make by hand.
The car on the picture has a single stage paint. It's easy to differ which side was freshly polished and which is not. The left side was hand polished with an All-In-One polish (light polish with added paint protection) by hand with a common yellow rounded applicator. After that a single coat of a paint sealant was added to the finish.
The result is the evidence, that even old and dull single stage paints can be brought back to life without to much trouble.