Exclamatory Sentence
An exclamatory sentence, or exclamation, is a more forceful version of a declarative
sentence. An exclamatory sentence ends with an exclamation
mark.
Examples:
 Here she
comes!
I am not
taking it!
An imperative sentence (i.e., an order) can end with an exclamation mark
too.
Example:
Leave it
alone! (This is not an exclamatory
sentence, but an imperative sentence.)
Avoid using exclamation mark in formal writing - they are considered somewhat
crass. In official correspondence, your power of expression needs to be strong
enough the negate the need for exclamation marks. Also, using two or more
exclamation marks consecutively is considered rude or juvenile.
I will be ready!!!! 
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See also:
Glossary of grammatical terms
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