Over the years, eBay has introduced all sorts of different auction types, in an effort to give people more options when they buy and sell their things on eBay.

For every seller who doesn't like the idea that their item might sell for a far lower price than they intend, there's another who wants to shift hundreds of the same item quickly. EBay tries to cater to all tastes. This email gives you an overview of the different kinds of auctions and their advantages for you.

Normal Auctions.

These are the bread-and-butter of eBay, the auctions everyone knows: buyers bid, others outbid them, they bid again, and the winner gets the item. Simple.

Reserve Auctions.

Reserve auctions are for sellers who don't want their items to sell for less than a certain price - a concept you'll know about if you're familiar with real auctions. They work just like normal auctions on eBay, except that the buyer will be told if their bid does not meet the reserve price you set, and they'll need to bid again if they want the item. If no-one is willing to meet your price, then the auction is cancelled, and you keep the item.

Fixed Price ('Buy it Now') Auctions.

Buy it Now auctions can work in one of two ways. You can add a Buy it Now button to a normal auction, meaning that buyers can choose either to bid normally or to simply pay the asking price and avoid the whole bidding process. Some sellers, though, now cut out the auction process altogether and simply list all their items at fixed price. This lets you avoid all the complications of the auction format and simply list your items for how much you want them to sell for.

Recently, eBay added a twist to fixed price auctions: the 'best offer'. This means that buyers can contact you to negotiate a price, which could be a good way to get sell some extra stock at a small discount. The only downside to reserve and fixed price auctions is that you pay a small extra fee to use these formats. In general, it is more worth using reserve auctions for higher-priced items and fixed price auctions for lower-priced ones - but remember that you can combine the two formats.

Multiple Item ('Dutch') Auctions.

These are auctions where you can sell more than one of a certain item. Dutch auctions can be done by bidding. Buyers bid a price and say how many items they want, and then everyone pays the lowest price that was bid by one of the winning bidders. If you have trouble getting your head around that, then don't worry - everyone else does too! These auctions are very rare.

What is more common is when a seller has a lot of one item, and lists it using a combination of two auction types: a multiple-item fixed price auction. This just means that you can just say how many of the item you they have, and offer them at a fixed price per unit. Buyers can enter how many they want and then just click Buy it Now to get them.

Now that you know about the different types of auctions, you should make sure that the items you plan to sell don't violate eBay's listing policies. The next email will let you know what's allowed and what is a big no-no.

While you can sell most things on eBay, quite a few things are banned. If you try to sell any of these things then eBay will remove your auction and all bids will be void.

Here is eBay's full list of prohibited or questionable items:

Academic Software

Airline and Transit Related Items

Alcohol (also see Wine)

Animals and Wildlife Products

Anti-circumvention Policy

Artifacts

Authenticity Disclaimers

Autographed Items

Batteries

Beta Software

Bootleg Recordings

Brand Name Misuse

Catalog Sales

Catalytic Converters and Test Pipes

Celebrity Material

Charity or Fundraising Listings

Comparison Policy

Compilation and Informational Media

Contracts and Tickets

Counterfeit Currency and Stamps

Counterfeit Items

Credit Cards

Downloadable Media

Drugs & Drug Paraphernalia

Electronics Equipment

Embargoed Goods and Prohibited Countries

Encouraging Infringement Policy

Event Tickets

Faces, Names and Signatures

Firearms, Ammunition, Replicas, and Militaria

Fireworks

Food

Freon and Other Refrigerants

Gift Cards

Government IDs and Licenses

Hazardous, Restricted, and Perishable Items

Human Parts and Remains

Importation of Goods into the United States

International Trading - Buyers

International Trading - Sellers

Lock picking Devices

Lottery Tickets

Mailing Lists and Personal Information

Manufacturers' Coupons

Mature Audiences

Medical Devices

Misleading Titles

Mod Chips, Game Enhancers, and Boot Discs

Movie Prints

Multi-level Marketing, Pyramid and Matrix Programs

OEM Software

Offensive Material

Pesticides

Plants and Seeds

Police-Related Items

Political Memorabilia

Postage Meters

Pre-Sale Listings

Prescription Drugs and Devices

Promotional Items

Real Estate

Recalled Items

Recordable Media

Replica and Counterfeit Items

Satellite and Cable TV Descramblers

Slot Machines

Stocks and Other Securities

Stolen Property

Surveillance Equipment

Tobacco

Travel

Unauthorized Copies

Used Clothing

Warranties

Weapons & Knives

Wine (also see Alcohol)

Most of this is very obvious - of course you can't sell illegal things like drugs, pyramid schemes or stolen goods. Almost everything that is on the list is there because there is law against selling it. Some of the reasons, though, are a little strange.

The 'autographed items' entry, for example, doesn't mean that you can't sell anything that's been autographed - it just means that you can only sell it if it comes with a certificate of authenticity. The 'artifacts' entry prohibits you from selling Native American graves; 'celebrity material' means you can't sell unauthorized pictures of celebrities; 'embargoed goods' means that you can't sell anything that comes from Cuba… on and on it goes, and most of it you never need to know.

If your chosen kind of item seems to be on the list, though, and you're concerned that you might not be able to sell it, then check the full list at http://pages.ebay.com/help/policies/items-ov.html to see whether the item is banned entirely or there are just a few restrictions.

EBay says it will remove any items that it believes violate copyright law, but in reality they don't have that many people to monitor the site. You will generally only find that your auction gets removed if someone decides to report you - and even then, they might not get around to it.

Really, buying and selling on eBay can sometimes feel more complicated than it really is, thanks to all the rules surrounding it - not to mention the jargon. Our next email is a 'jargon buster', to help you learn the language of eBay.

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