How do you say a pleasure in Portuguese?

There are a few ways to say "a pleasure" in Portuguese, depending on the context:

Formal:

* O prazer é meu: This is the most common and formal way to say "the pleasure is mine".

* É um prazer: This means "it's a pleasure" and is also quite formal.

* Com prazer: This means "with pleasure" and is a bit more informal than the other two.

Informal:

* De nada: This means "you're welcome" and is the most common informal response to someone saying "thank you".

* Imagina: This means "imagine" and is a casual way of saying "don't mention it".

* De boas: This is a very informal and colloquial way of saying "no problem" or "don't worry about it". It's commonly used among friends and young people.

The best way to choose the right phrase depends on the context and your relationship with the person you are speaking to.