3DVia Composer Player Vs 3DVia Composer

I am new to 3DVia Composer software so obviously I have lots of questions but here are a few

What is the difference between the player and composer?

Is it possible to open solidworks Assembly directly from the player or you have to use Composer?

What is the best way to get your files from SW to Composer to create the different views?

This should do for now. Thanks for any information.

SolidworksComposer