• Learn the definition of an exclamation mark
• Study usage of exclamation marks

• An exclamation mark looks like this:

        !

• An exclamation mark indicates the end of a sentence that is either an actual exclamation, or is intended to be astonishing in some way 

• "Wow!"

• "Stop!" (a command)

• "They were the footprints of a gigantic hound!" (astonishing)