That would be called an "essay".
It is a short piece of writing on a particular subject like cats.
A piece of writing that is usually short and focuses on one subject is called an essay. Essays can vary in style and purpose, such as persuasive, descriptive, or narrative, but they typically explore a specific topic or argument in a concise manner. They are often used in academic settings to develop critical thinking and writing skills.
the subject of a talk, a piece of writing, a person's thoughts
A short piece of writing on a particular subject.
The controlling impression in a piece of writing conveys a clear and distinctive perspective on the subject. It maintains a consistent tone and focus throughout the piece of writing
Using organization in writing helps to guide the reader's understanding by presenting one subject at a time, before moving onto the next. This creates a logical flow and makes it easier for the reader to follow and comprehend the information presented. Therefore, it is generally best practice to organize writing in a way that discusses one subject before transitioning to another.
Essay
The official definition of the word essay is "a short piece of writing on a particular subject."
the theme is, according to Google - The subject of a talk, a piece of writing, a person's thoughts, or an exhibition; a topic: "the theme of the sermon was reverence"
If the piece of writing has 'I' and 'Me' or my
An essay is a piece of writing.
The word topic is a noun. It means a subject or theme.