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The word Audacity is a Noun.
No. Audacity is completely free and legal.
PNG is an image file format, such as JPEG or BMP. One of the differences between PNG and JPEG, is that PNG supports transparency.
Audacity is a noun that means:
a. bold courage; daring.
b. shameless or brazen boldness; insolence.
Example sentences:
The Audacity of Democracy was created in 2009.