Tu vs. Ud

When speaking with the President, you would speak in a proper voice. You wouldn't say "Hey dude! What's cracking" You would say "Hello Mr. President how are you today?" However you might say "hey! what's up?" to the President's daughter.

     In order to do this you have to know

     1. What is formal and what isn't.

     2. Who you are speaking to.

     3. When to use Tu and when to use Usted.

When asking the Presidents daughter her name you would say "Hola! Como te llamas tu?

Tu is the Informal way of saying you. Usted is the formal way of saying you.

So when asking the president his name you would say "Hola! Como se llama ud.?