There are surprisingly many different kinds of bottle openers out there, but the two most popular by far are corkscrews and bar blades or crown cork removers. Corkscrews are used for opening bottles with corks, such as bottles of wine or champagne. To use them, you just screw them into the cork, and then push down on the sides and pull the cork out.

Bar blades and crown cork removers, on the other hand, cannot open corked bottles. They are basically just the end section from a corkscrew, used to quickly open capped bottles. There is nothing they can do that a corkscrew can