Correct answer - "SNS" : Amazon SNS follows the 'publish-subscribe' (pub-sub) messaging paradigm,
with notifications being delivered to clients using a 'push' mechanism that eliminates the need
to periodically check or 'poll' for new information and updates.
Incorrect:
"SQS" - SQS is a distributed queuing system. Messages are not pushed to receivers. Receivers have
to poll SQS to receive messages
"Kinesis" - Used for processing big data
"SES" - Amazon SES is an inexpensive way to send and receive emails