There are two types of cholesterol, more commonly known as Good (HDL) and Bad (LDL).
If your bloodstream has too much of the LDL it will result in plaque forming in the arteries. This means that over time, blood will have difficulty travelling through your arteries because they become narrowed thanks to the amount of bad cholesterol clogging the walls.
Dietary cholesterol is not the one responsible for your having high cholesterol in the blood, it is actually excessive amounts of saturated fat along with Trans fat that is to blame for the tightening of the arteries.
In essence to keep your cholesterol on the low side you should eat plenty of unsaturated fats and fibrous foods, as well as plenty of regular exercise.