A paragraph is a self-contained unit of discourse, consisting of one or more sentences that develop a single, cohesive idea or topic. Acting as the building blocks of writing, paragraphs organize information, provide structure, and improve readability. They typically include a topic sentence, supporting details, and a concluding sentence.

Key elements and structure of a paragraph include:
- Topic Sentence:Â Introduces the central, controlling idea of the paragraph.
- Supporting Sentences:Â Develop, explain, and provide evidence or examples for the main idea.
- Concluding Sentence:Â Summarizes the point or transitions to the next idea.
- Unity and Coherence:Â All sentences within the paragraph must relate to the single topic to maintain focus.
- Length: While often 4–6 sentences, length is flexible depending on the purpose, ranging from a single sentence to several, say Purdue OWL and LibGuides.Â
Paragraphs are crucial for separating different points in an essay or article, making complex information easier to digest.