Test

• Length: Typically around 150 characters, or 1-2 sentences, to avoid being cut off in search results.
• Purpose: To provide a compelling summary that includes relevant keywords and accurately reflects the page's content.
• Location: Appears under the title and URL in a search engine results page (SERP).
• Function: To persuade users to click on your link over others, by clearly explaining what the page is about and what value it offers. 

How to write an effective one

• Include the primary keyword: Make sure the main keyword or phrase for the page is in the description so searchers can see the relevance immediately.
• Address search intent: Write the description to answer the user's likely question or need.
• Use imperative sentences: Start with a verb to tell the user what to do, making it more persuasive (e.g., "Discover the best..." or "Learn how to...").
• Be unique: Create a unique description for every page to avoid duplication and give each page its best chance to be relevant to a specific search query.