Beat

Hey guys,
I've read some screenplays from famous movies and I've constantly found the word "beat." Does this word refer to any facial expression or mood? What does it mean?
Here are a couple of examples:

This is an extract of dialogue from the movie script "Inception" written by Christopher Nolan:
SAITO
That you're here to steal from me?
(beat)
Or that we're actually asleep?

The word "beat" in parenthesis is an indication for the actor.

This is another extract of dialogue from the movie script "Krampus":
MAX
Ummm, hey Howie...
(beat; searching)
Soooooo what’d you ask Santa for
this year?

Again, the word "beat" in parenthesis is an indication for the actor.

What does the word mean in these examples? Something like "perplexed", or "baffled"?

Thank you in advance.
 
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