As the name suggest anal vibrators are sex toys that are design for anal stimulation.  Many have features like inflatable or even ejaculating, some are designed to stimulate the vagina and the anus at the same time.  The important things about anal sex toys are that they are smooth and seamless and should have a large base or something to stop them going to far in.

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How to use

As with all anal play use plenty of lubricant and go slow at least until you are comfortable with it.  That is really all there is to it.  However it is important to point out you should clean your toys well after use and never go from anal to vagina with out at least thoroughly cleaning your sex toy.  And again if you must share your sex toys don't share them with out cleaning them first.

Show me some anal vibrators.