APD is a difficulty with processing or interpreting sounds by that brain, despite having normal hearing. It can be simply defined as a problem with what the brain does with what it hears.
People with Auditory Processing Disorder difficulties often have normal hearing sensitivity, but their brain struggles to interpret, organize, and remember what is said, especially in background noise. Children with auditory processing problems are weak in some basic skills for decoding and remembering what they hear. They often miss or misunderstand information that is conveyed orally, in instruction or conversation.