You can give tickets as a gift and buy them for other people, but you cannot transfer the ticket to someone. For example, some people have tried to use one ticket to get multiple people into a party. One person goes through the turnstile, somehow hands off the ticket to the next person who then goes through, etc. Giving a gift to one person for that one person alone to use is fine. Transferring a ticket so that two or more people try to enter on that same ticket is a no go.