Broadly speaking, there are two components to what we do: UX writing and content writing. What I’ve described above is what you’d call UX writing. Like UX design, it’s focused on ratifying a user’s needs with a technical product.
Content writing is more about the form of a product than its function. Users need to connect with content, relate to it, and enjoy it. UX writing, on the other hand, should meld with your product, and go unnoticed.
With that said, these principles form a good basis for all web writing, and help us build products that our users can wield like extensions of themselves.
Source: UX Magazine