Explain me what is "transcient schemic attack" , isnt it also a stroke?

TIA: Transient (temporary) ischemic attack - it is a temporary condition most commonly causing visual changes ie like a window shade is pulled down over the eye. These are very short lived usually 2-3 hours but can last up to 24 hours. They do not lead to damaged brain tissue. You should see a neurologist or internist if these occur. It may be the harbinger of worse strokes.

"Mini stroke": Tia (transient ischemic attack) is a temporary interruption of blood flow to a part of the brain resulting in the same symptoms as a stroke (visual problem, facial droop, arm/leg weakness, speech difficulty, etc). The difference is that the symptoms are temporary (<24 hours). Tias are often followed by and serve as a major warning sign of impending stroke. If you are having TIA symptoms, see a md.