I need to know what's an ovarian cyst?

Different types: Ovarian cysts are collections of fluid, or soft or hard tissue that develop within the substance of the ovary. They can be normal- where the body produces eggs & hormones every month; or they can be either benign or malignant tumors. The size, and characteristics give an idea of whether they are benign or not. Most simple cysts are small, and resolve on their own with time.