Denpasar is capital city of Bali's Province. It's not a tourism destination and maybe only this place in Bali which we can call it as a real city. As you may already know, that other area such as Ubud, Singaraja, Lovina, they are only a small-medium village.
Like other capital city in Indonesia, all of government activities was done in there. From the Governor office, Police office, Mayor office, until the immigration office are in there. All of Bali's citizen must go there to make their purpose done, about make a license of their business for the example. And all tourist in Bali must do the same too.
In Denpasar you will see some kind of etnics people in Indonesia where they lived in Bali. We can see them in private offices especially, where in a room office has some employees which come from Bali, Sunda, Irian, Dayak, Lombok, Madura, etc. This way indicate Bali is the biggest reason of a lot of people to work in there.
Like other big city in Indonesia, Denpasar has a landmark too, Which in Jawa island it called "Alun-lun". It's a big place or like a field which have a monument in the middle of it. And the inside, it have public facilities and merchant. In Denpasar it has name Puputan Renon Landmark.