There are many different LED globes on the market now and all of them are designed to replace existing lamps and globes with a specific lamp base, end cap, or connection.
Bayonet and Edison Screw base globes are the most common, others are used in commercial lighting applications. There are numerous different sizes available also, so in the nomenclature, following the type of base, there will also be a number representing the size of the base.
For example, a B22 base stands for Bayonet with 22mm diameter base.
See the image above for the more common bases and their operating voltage.