2 Stroke & 4 Stroke Engine Basic He Takes intake Stroke at 180° 

4 Stroke Engine forward there energy by 4 stroke to the Engine cranck shaft which is known as 4 stroke Engine.
2 Stroke Engine forward there energy by 2 Stroke to the Engine cranck shaft which is known as 2 Stroke Engine.
What is 2 Stroke Engine?
What is 4 stroke Engine?
what is basic difference in-between 2 Stroke and 4 stroke Engine?