Here are some examples:
* Eles estão namorando. (They are dating.)
* Você está namorando alguém? (Are you dating anyone?)
* Eu quero namorar. (I want to date.)
Note: There are other, less common words that could be used to refer to "dating" in specific contexts:
* Sair com alguém - This literally means "going out with someone" and can be used to refer to a casual date.
* Ter um relacionamento - This literally means "having a relationship" and can be used to refer to a more serious relationship.
However, "namorar" is the most common and versatile word for "dating" in Portuguese.