Yes. AnkiApp allows you to easily share decks with friends via email.
From the deck screen, open the menu, using the icon in the top-right corner of the screen, then select the "Share" menu item.
Enter their email and click "Share", and they'll be sent an email, telling them you've shared a deck with them, and inviting them to get AnkiApp if they don't already have it. If they are a current AnkiApp user, the email will look like this:
Note: Shared decks are only visible to people you share them with—-they are not publicly visible.
Yes. To share with many people at once, enter all of their emails, separated by commas.