bitte
please
A particle used to formulate a polite request or instruction.
Gib mir bitte das Salz.
Please pass me the salt.

please
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please
A particle used to formulate a polite request or instruction.
Gib mir bitte das Salz.
Please pass me the salt.

The word 'bitte' comes from the verb 'bitten' (to ask/request). So when you say 'bitte' (please), you are literally formulating a small 'Bitte' (request).
Ich möchte Sie um einen Gefallen bitten.
I would like to ask you for a favor.
The meaning of 'bitte' depends heavily on the situation. Whether it is a request, a response to 'Danke' (thank you), or an offer can be recognized from the context and from the reaction of the person you are speaking to.
Hier, bitte, das ist für Sie. – Oh, danke! – Bitte!
Here you go, this is for you. — Oh, thank you! — You're welcome!
In a polite request or instruction, 'bitte' can flexibly stand at the beginning, in the middle, or at the end of the sentence without changing the meaning.
Bitte schließen Sie die Tür.
Please close the door.
In response to 'Danke' (thank you), 'bitte' (you're welcome) is the most common and natural answer. It is short, polite, and used in almost all situations.
Hier ist dein Kaffee. – Oh, danke schön! – Bitte.
Here is your coffee. — Oh, thank you very much! — You're welcome.
If you did not understand something, 'Wie bitte?' (Pardon?) is a polite and neutral way to ask for repetition. It is much more polite than 'Was?' (What?).
Entschuldigung, die Verbindung war schlecht. Wie bitte?
Sorry, the connection was bad. Pardon?
The forms 'bitte schön' and 'bitte sehr' are somewhat more formal or emphatic than the simple 'bitte'. They are often used in service situations when handing something to someone.
Einmal Pommes mit Ketchup, bitte sehr!
One order of fries with ketchup—here you are!
once / times
'mal' and 'bitte' can both appear in instructions and make them sound friendlier. 'bitte' is the normal word for a polite request and fits almost any situation. 'mal' sounds more casual and everyday. It makes an instruction less strict, but it is not as clearly polite as 'bitte'. Learners may confuse the words because both can appear in sentences like 'Komm mal' or 'Komm bitte'. If you definitely want to sound polite, use 'bitte'. If it should sound casual and familiar, 'mal' often fits well.

Schick mir bitte die Adresse vor dem Termin.
Please send me the address before the appointment.
Timo, schau mal kurz auf diese Nachricht.
Timo, just take a quick look at this message.