Professional writing differs from other types of writing, such as academic and technical writing, because the term defines a general overview of writing that is done for profit in a workplace environment. Professional writing differs from academic writing due to the difference in purpose and readership between the two styles. Academic writing informs the audience through a critical approach and directs further thinking by reconstructing the order of the author's thinking and the intertextual traces of their reading, while professional writing is applied to a business or setting (a hospital, a company, or a factory) and is meant to facilitate work through communication. The audience of academic writing is also limited in contrast to professional writing; specialized experts in specific fields make of the primary readership of academic writing while the amount and identities of readers of professional writing can be varied. When writing, professional writers must take into consideration the possibility of unexpected tertiary readers who can come across their document.