A paragraph is a group of sentences that focus on a single idea or topic. It usually starts with a topic sentence that introduces the main point, followed by supporting sentences that provide details or examples. This structure helps readers understand the writer's message clearly and keeps the writing organized. In writing, paragraphs are essential for breaking up text and making it easier to read. Each paragraph acts like a mini-section within a larger piece, such as an essay or article. By using paragraphs, writers can guide readers through their thoughts, making complex ideas more accessible and engaging.