Author's purpose refers to why an author writes a particular piece - whether it is to inform, persuade, entertain, or express feelings/emotions.
The intended group of readers or listeners for whom a piece of writing is created.
Bias refers to the author's inclination or prejudice that may influence their writing.
Rhetorical appeals are persuasive strategies used by authors to appeal to the audience's emotions (pathos), logic (logos), or credibility (ethos).