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A jar opener is a kitchen device which is used to open glass jars. Many people can remove the lids of glass jars by hand. Some people cannot and others prefer to use a jar opener.
A traditional jar opener will have two handles, leading up to two concentric grooved rings which can be used to fit different jars. It also sometimes has a device to open a bottle on it.
References
Jar opener Wikipedia(Text) CC BY-SA