どちら

どちら
pronoun
which (of two); where (polite)
1. which one (of two)
Used to ask about a choice between two options. The polite form of どっち.
どちらいいです
Which one would you like?
Red or blue, which will you choose?
Which do you prefer, tea or coffee?
Which arrives faster, train or bus? I don't want to be late for work.
2. where (polite)
A polite way to ask where someone is from or where they are going.
Where are you going?
Polite 'where' meaning
Where are you from?
Where do you live?
Where are you from, sir/madam?
Which direction are you heading? Shall I give you a ride?
3. who (polite)
A polite way to ask who someone is, often used in business contexts.
Who is it? / May I ask who's calling?
Very polite 'who' meaning
Excuse me, but may I ask who you are?
Where do you work?
Asking about affiliation
Which company are you from?
(おそ)()ります、どちら(さま)でしょう。お名前(なまえ)()かせいただけます
I'm sorry, but may I ask who you are? Could you tell me your name?
Very formal inquiry

どちら is a polite word with multiple uses. For asking 'which of two,' どっち is the casual equivalent. どちら is part of the ko-so-a-do demonstrative series: こちら (this way), そちら (that way), あちら (over there), どちら (which way). In formal settings, どちら(さま)です is used to politely ask someone's identity.