An implant-supported denture is supported by and attached to a dental implant. Here's a little more about how implant supported dentures work.
Dentures
Dentures are dental prosthetics that replace missing teeth. Most conventional dentures are removable, and are usually supported by the soft and hard tissues of the oral cavity.
Dental Implants
Dental implants are tiny titanium rods that are implanted into the jaw bone. These tiny rods act as replacements for the roots of missing teeth. Dental implants can be capped with a dental crown to create a permanent and natural looking replacement for missing teeth. These capped dental implants look and feel very much like natural teeth.
How do dentures and dental implants work together?
An implant-supported denture is a good option for people who don't have any teeth in the jaw, but have enough bone in the jaw to support implants.
As mentioned above, a regular denture rests on the gums, and is not supported by implants.
Implant-supported dentures have special attachments that snap onto corresponding attachments on the implants to help hold the denture securely in place.
Generally, implant supported dentures are made for the lower jaw, since regular dentures tend to be less stable there. However, you can get an implant-supported denture in either the upper or lower jaw.