One of the most common hair terminologies is hair bundles. Whenever you are talking about the hair you will always hear people bring about the term bundles.
Well, have you ever seen the hair extension? You will notice that it comes in a long weft. When buying the hair, therefore, you buy then in a set of 3 or 4 bundles per package. In short, it refers to the single weft hair that is normally rolled and tied loosely for use.
A closure is not a wig but rather, an attachment used to close a weave without the use of the natural hair. This mimics either a lace wig or a silk top and is usually sewn in along with weaving or making a custom wig by hand.