The Tonsils are lymphoid tissues found on both sides of the mouth. The tonsils sit far back in the mouth on both side of the tongue. When they become inflamed, tonsillitis is said to have developed.
The Adenoids are also lymphoid tissue that sits above the tonsils in the post nasal space. When enlarged, they can cause blocked nose, noisy breathing and snoring.
The usefulness of the tonsils and adenoids are in the first years of life where they help with the immunity of the child. As the child grows, the function of the tonsils and adenoids diminished. They can be removed if they cause medical problems or obstruction.