An emergency action message is like a super important message that tells people what to do when there is an emergency. When something bad happens, like a natural disaster or an attack, the people in charge need to send out a message fast to make sure everyone is safe. The emergency action message tells people what they need to do to stay safe and what actions they should take if they need to help others. It's like a really important memo that is sent out to everyone who needs to know. So, if you ever hear someone talking about an emergency action message, it means something really important is happening and everyone needs to listen to what they're being told.