Okay, I need to create a Wikipedia-style document about "Meta Description" under the categories of Technology -> Web Development -> HTML Element Optimization. Let me start by understanding what exactly is required here.

First, the structure: H1 for the title, an overview section, several sections with H2 and H3 headings, and maybe references or related documents. The content needs to be accurate, objective, detailed enough, easy to read, and use technical terms with explanations. Also, markdown formatting with proper hierarchy, lists, tables, code blocks if needed, and the document should be at least 800 characters long.

Starting with the title: "메타 설명" (Meta Description) as given. Then an introduction that explains what a meta description is, its purpose in SEO, and why it's important for web developers.

Next, sections. Maybe break down into sections like "What is Meta Description?", "Importance in SEO", "Best Practices for Writing", "Common Mistakes to Avoid", and "Examples". Each of these can have H2 headings. Under each, more detailed points with H3 if needed.

For the "What is Meta Description?" section, I should explain that it's an HTML attribute providing a brief summary of a webpage. Mention the tag, its placement in the head section, and how search engines use it to generate snippets.

In the SEO importance section, talk about how meta descriptions influence click-through rates from SERPs, their role in user experience, and that while not a direct ranking factor, they affect engagement which can indirectly impact rankings. Maybe include some stats or examples here.

Best Practices: Keep it concise (150-160 characters), use keywords naturally, make it unique per page, avoid duplication, include a call to action, and ensure it's relevant to the content. Maybe add a table comparing good vs bad examples.

Common Mistakes: Using duplicate descriptions, making them too long or short, not including keywords, using generic phrases, or ignoring mobile optimization. Each of these can be an H3 under the mistakes section.

Examples would help. Provide code snippets showing correct and incorrect usage. Also, maybe a sample of a well-written meta description versus a poor one.

Need to check for technical terms: explain "SERPs" (Search Engine Results Pages) if necessary. Maybe define "click-through rate" as well. Ensure that the language is clear and not too jargon-heavy but still professional.

Also, make sure to mention that while meta descriptions don't directly affect SEO rankings, they are crucial for user engagement. Highlight their role in attracting users to click on the link from search results.

Check if there's any need for references or related documents. Maybe link to Google's guidelines on meta tags or other SEO resources. But since it's a wiki-style document, perhaps just mention them in a "References" section at the end.

Now, structure all this into markdown. Start with H1, then overview. Then each main section as H2, sub-sections as H3 if needed. Use bullet points for best practices and common mistakes. Include code blocks for examples.

Make sure the total length is over 800 characters. Let me count: the example I have in mind should be sufficient. Also, check that all sections are covered and the information is accurate. Avoid any subjective statements; stick to facts and established SEO practices.