Carafes are split into four sections. I have done this in a way I hope makes easy to find things.
You might think you have a decanter, but there is a reasonable chance it is a carafe even if it has a stopper. The way to check is to run your finger down inside the neck of the bottle where the stopper goes. In a decanter you can feel where the inside of the neck has been ground or polished so that the stopper fits snugly and creates an air seal for the contents. If the inside of the neck feels like one continuous curve then it is probably a carafe. If it came with a stopper and the stopper also wobbles about, then don't put it in as it will only crack the neck open at some point. Also, another point to remember is that not all carafes have wide necks to give them away as such.
Carafes may be written off as the poor cousin of the decanter, but they have advantages as a collectable and uses. You never have to worry about the stopper being correct as they don't have one. They are good if you just want to water on the table, or put out wine you know is going to be drunk. Carafes can be similar to decanters, but quite often have their own charm just as carafes.
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