please

The word "por favor" is the essential marker of politeness in Portuguese. It functions as a softening agent for requests or commands, signaling that the speaker is making a polite appeal rather than a demand. Imagine it as a verbal "tip of the hat" that acknowledges the other person's agency. In practice, it is extremely flexible and can be placed at the beginning, middle, or end of a sentence. While it is standard in almost all social interactions, omitting it can make a speaker sound abrupt or rude, especially when asking for services or favors. It is most commonly paired with the conditional tense ("poderia...") for maximum politeness.
In conversation
Asking for a coffee
Um café, por favor.
A coffee, please.
Claro, aqui está.
Sure, here you go.
The most common way to order in a cafe.
Requesting help from a colleague
Você poderia me ajudar com este relatório, por favor?
Could you help me with this report, please?
Posso sim, sem problemas.
I can, no problem.
Adding 'por favor' at the end of a request makes it sound much more professional.
Examples
Por favor, sente-se.
Please, sit down.
Poderia repetir, por favor?
Could you repeat that, please?
Por favor, não se incomode com a bagunça.
Please, don't mind the mess.