It can be used to describe:
* The language: "Portuguese is a Romance language."
* The people: "Portuguese people are known for their hospitality."
* The culture: "Portuguese cuisine is rich and diverse."
* The country: "Portugal is a beautiful country with a rich history."
For example:
* "I am learning the Portuguese language."
* "She met a Portuguese man on her trip."
* "The Portuguese culture is fascinating."
* "I visited the Portuguese capital, Lisbon."