What does adding salt to boiling water for pasta do?

I believe the purpose of adding salt to boiling water for pasta is twofold.

1) By adding salt to water for boiling - this increases the temperature at which the water will boil - which will help the pasta to cook more quickly.

2) Adding the salt to the water will actually salt the pasta better - instilling the flavor into the pasta as opposed to just adding it on top of the pasta...

From what I've been told, it also helps keep the pasta from making sticky clumps in the pot...