It's a blurb. A short description of a book, film, etc., written by the people who have produced it, and intended to make people want to buy it or see it
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What's this?
It's a brochure. A type of small magazine that contains pictures and information on a product or a company.
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What's this?
It's a letter.
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What's this?
It's a diagram. A simple plan that represents a machine, system, or idea, etc., often drawn to explain how it works.
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What are they?
Instructions.
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What's this?
It's a blog. A regular record of your thoughts, opinions, or experiences that you put on the internet.
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What's this?
It's a leaflet /ˈliflɪt/. A piece of paper that gives you information or advertises something.
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What's this?
It's a greetings card.
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What's this?
It's an advertisement.
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What's this?
It's a flyer. A small piece of paper with information on it about a product or event.