Acquired Brain Injury (ABI)
An acquired brain is an injury to the brain, which is not hereditary, congenital, and degenerative or caused by birth trauma.

Traumatic Brain Injury (TBI)
Traumatic brain injury is a type of an acquired brain injury. Traumatic brain injury is caused when a force impacts the brain affecting cognitive (thought process) and or physical (movement) functioning. There are two types of TBI: open head injury (also know as a penetrating injury) and closed head injury

Open and Closed Head Injuries
Open head injuries' where the skull has been penetrated: an example of this includes a gunshot or a sharp object, which has pierced the skull.

Closed head injuries' refer to injuries where the skull remains intact, an example of this is shaken baby syndrome, or a car accident where a collision caused the brain to jolt, causing tissue damage as it impacts against the skull. There is no visible wound with closed head injuries.