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@type: article, what does it mean?
'"@type": "article"' is the core declaration of structured data in the schema, which means:
The main content of this web page is an article."

More detailed explanation:
1. '@type': This is a 'type' identifier derived from Schema.org, a globally used taxonomic glossary. It is used to define what "type" the thing you are describing.
2. 'article': This is the specific value of '@type', specifically referring to the content type of article. It is suitable for blogs, news reports, tutorials, technical analysis, and other text-based independent content.
What is the use of telling search engines?
When a search engine (like Google) sees '"@type": "article"', it will understand:
Content nature: This is not a product page, An event page or a company homepage, but an article that can be read.
What information should be extracted: Since it is an article, search engines will pay special attention to and may display specific information related to it, such as:
'headline' (title): The main title of the article.
'author': Who wrote this article.
'datePublished' / 'dateModified' (published/modified): This is important for news or time-sensitive articles, where search engines may display "Published 2 days ago" in the results.
'image' (with picture): A representative image of the article.
'description': A brief summary of the article's content.
Potential for special feature: In search results, a piece of content clearly defined as 'article' may be displayed in a richer format, such as displaying the date, author, or receiving exposure in sections like "Noteworthy News."
Other common '@type' examples:
'"@type": "Product"': indicates that this is a product page Search engines will expect to see information such as prices, reviews, inventory status, etc.
'"@type": "LocalBusiness"': Indicates that this is a local business page and will expect to see the address, phone, and opening hours.
'"@type": "Event"': Indicates that this is an event page and will look forward to seeing the event start time, location, and ticket price.
'"@type": "Recipe"': This means that this is a recipe and you will look forward to seeing the cooking time, ingredients, and production steps.
Simple analogy:
is like labeling a document.
You post an 'article' tag, and others will know that it is text content and will pay attention to the author and date.
You put a 'product manual' label, and others will know that it is a product introduction and will pay attention to the price and model.
If you put up an 'event poster' label, others will know that it contains event information and will pay attention to the time and location.
'"@type": "article"' is to label this web page with the "article" tag, so that search engines, the "others", can quickly and accurately understand it.
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