Final answer:
Meningitis is inflammation or infection of the membranes covering the brain or spinal cord. It can be caused by bacteria or viruses and requires prompt medical treatment to prevent complications.
Step-by-step explanation:
Meningitis is an infection or inflammation of the membranes covering the brain or spinal cord. It is characterized by symptoms such as fever, headache, and a stiff neck. Meningitis can be caused by either bacteria or viruses, and bacterial meningitis is generally more severe. Prompt medical treatment is necessary to prevent serious complications.