What is a vesicle in biology

i'm writing down syllabus points for biology in my workbook and there was a Q about vesicles. I listen in class but i swear i have never heard of this :LL. if someone could give me a brief description, that would be sweet

Generally in biology a vesicle will be described to you as something that is transporting proteins. But all the things that the first guy said are certainly true. It's like a bubble that is enclosed by the same type of phospholipid bilayer as the entire cell is enclosed in. for the sake of simplicity though you should probably just think about as being like a taxi cab that transports something from one place to another. Even though it is actually much more complex than that all you really need to know for now is that it transports materials and quite often there's proteins involved that are either being transported into or out of the cell. When something large needs to be brought into the cell, the cell wall will envelope it and that part of the cell wall will break off and form a vesicle. Below is a video.

http://www.sumanasinc.com/webcontent/ani…

A bubble-like membranous structure that stores and transports cellular products, and digests metabolic wastes within the cell.

A vesicle can be visualised as a bubble of liquid within another liquid, a supramolecular assembly made up of many different molecules. More technically, a vesicle is a small membrane-enclosed sack that can store or transport substances.

http://en.wikipedia.org/wiki/Vesicle_(bi… <--- nice resource