What is gliosis? and Do neurons bear mitosis?

So I have heard of gliosis and I just can't find an explanation.
I own asked teachers and googled but no luck.
The wikipedia page makes it impossible to understand, so can someone explain surrounded by SIMPLE words what it is.

And do some neurons undergo mitosis, cause my friends biology teacher said they do but I don't devise they do.

Anyway, and you dont need to be to simple I know a lot of neuroscience but i just dont carry this "gliosis".

Any help is much appreciated.
Thank you.
1) Do neurons undergo mitosis?
No.. Mature nerve cell are in the G0 phase of the cell cycle (a non-dividing phase) so they do not undergo mitosis.

2) What is gliosis?
Gliosis is a sign of central tense system (CNS) injury. The CNS includes the brain & spinal cord. Gliosis is a process leading to scars in the CNS that involves the production of a dense grating of astrocytes in areas of damage. Astrocytes are a type of glial cell - glial cells are supportive cell of neurons. Astrocytes accumulate in areas where neurons hold been damaged. Gliosis is a prominent feature of heaps diseases of the central nervous system, including multiple sclerosis and stroke. After a stroke neurons die and are replaced with astrocytes by gliosis.

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